| Web pages load slowly, if at all, despite fast download speeds Posted: 09 Feb 2022 12:01 PM PST I recently switched from Windows to Void Linux. I did not have this problem in Windows. Sometimes, seemingly at random, certain websites fail to load on every browser I try. This only happens on my Void Linux laptop. With my limited networking and troubleshooting skills, I have come to the conclusion that this is a problem with my DNS servers, however, changing them did not fix the issue. My problem seems to be the same as this question, and indeed, I am also completely unable to play music on soundcloud, and usually CDN's are broken for me as well. This is as far as my troubleshooting techniques can take me. I desperately need help in debugging this issue. |
| neomutt + neovim Posted: 09 Feb 2022 11:55 AM PST using: ubuntu 18.04, neomutt 20171215, neovim v0.6.0. i am new to neovim and neomutt nvim is the default editor in my neomutt. When i compose an email the text appears justified, and after i send the email the text looks fine. But if i view the same message in evolution (or i assume another desktop client) the line length and wrapping are lost, and i assume this is what the recipient sees, ie a mess of words I have these lines in my nvim/init.vim: set wrap linebreak nolist set number setl fo=aw2tq set colorcolumn=80
is there some way to ensure the message looks sensible to the recipient and the paragraph formatting is not lost? I think when i was using vim instead of nvim i didnt have this issue |
| Is there a "hostname -I" alternative that works on most Unix-like systems? Posted: 09 Feb 2022 11:32 AM PST I am writing a Bash script that requires the internal/private IP address. On a Linux system I normally use the hostname -I command. However, this does not work on some other Unix-like systems, most notably MacOS. Is there any command that does return the private IP address, that is present on most (if not all) Unix-like systems? |
| Cannot create custom partitions on a rhel 8 installation Posted: 09 Feb 2022 11:23 AM PST I am trying to install RHEL 8 on an older server that had been running CentOs 7 and can't seem to do custom partitions even though it will install if I allow it to create the partitions. Every time I try to do a custom install I get the error message: /boot file system cannot be type lvmlv. raid0 may not have enough space. I did an automatic install and logged in to see how the disk was partitioned: > md126p1 1.1M biosboot > md126p2 1G linux filesystem > md126p3 1T LVM
I tried repurposing the existing partitions created by the automatic install to the new installation. I tried deleting all partitions and repartitioning it using the same sizes. I even tried to use fdisk from a Slackware installation DVD to rewrite the partitons so that the RHEL installation wouldn't see the data from the old install. However, I got failed to write disklable. Operation not permitted. I have 4 disks configured as a Raid 5 in the BIOS. And, as I said, it is an older server that does not support efi. I can always do an automatic install and use lvm to create the additional partitions. But, I would like to figure out how to do this during the installation process. |
| Syntax Error near unexpected token `fi' in shell script Posted: 09 Feb 2022 11:07 AM PST This is my code, which is pretty simple and only has 5 lines if [ grep 'String to search' /data/directory1/*.log ] then echo "message when IF is successful" | mail -s 'Config Server Disconnect' myemail@gmail.com else echo "check" fi
But i'm continously getting the error line 6: syntax error near unexpected token `fi' Can someone please tell what's the error ? and what do i do fix it . When i run the grep and mail commands separately then they are successful, but not in the shell script file |
| Can I use only ALSA to select the sound card? Posted: 09 Feb 2022 11:02 AM PST If I select from alsamixer the nvidia sound card it doesn't work at all and I can't change the items value:  Some info: cat /proc/asound/cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xf3310000 irq 31 1 [NVidia ]: HDA-Intel - HDA NVidia HDA NVidia at 0xf3080000 irq 17
Kernel: 5.10.0-11-amd64 Distro: Debian GNU/Linux 11 (bullseye)
To use the monitor speakers can I use only ALSA? If I start pulseaudio I can use them. # pactl list short sources 1 alsa_output.pci-0000_00_1b.0.analog-stereo.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 2 alsa_input.pci-0000_00_1b.0.analog-stereo module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 5 alsa_output.pci-0000_01_00.1.hdmi-stereo-extra2.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED # pactl list short sinks 1 alsa_output.pci-0000_00_1b.0.analog-stereo module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 4 alsa_output.pci-0000_01_00.1.hdmi-stereo-extra2 module-alsa-card.c s16le 2ch 44100Hz SUSPENDED
On pasystray I can simply select the sink GP106 High Definition Audio Controller ... but sometimes it doesn't work. When PA is running if I select the HDA nvidia sound card with alsamixer is the same as before.
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| Tracking down symbols used by library in binary ELF as listed in memory map Posted: 09 Feb 2022 10:20 AM PST I have an application written in C++ that crashed during exit. The reason for the crash is understood, there are references to different versions of the same library mixed inside the executable. This is a mistake we are trying to track down so to help us do that we are hoping we can make use of the memory map dump created when the executable crashed. These are the relevant sections of the memory map: 7ffff5bc7000-7ffff5ccc000 r-xp 00000000 00:38 2348051668 /devel/utility/release/lib64/libUtils.so 7ffff5ccc000-7ffff5ecc000 ---p 00105000 00:38 2348051668 /devel/utility/release/lib64/libUtils.so 7ffff5ecc000-7ffff5ece000 r--p 00105000 00:38 2348051668 /devel/utility/release/lib64/libUtils.so 7ffff5ece000-7ffff5ed2000 rw-p 00107000 00:38 2348051668 /devel/utility/release/lib64/libUtils.so
7fbbf73c3000-7fbbf73ee000 r--p 00000000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so 7fbbf73ee000-7fbbf7462000 r-xp 0002b000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so 7fbbf7462000-7fbbf747e000 r--p 0009f000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so 7fbbf747e000-7fbbf747f000 ---p 000bb000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so 7fbbf747f000-7fbbf7481000 r--p 000bb000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so 7fbbf7481000-7fbbf7483000 rw-p 000bd000 00:31 2235616792 /devel/utility/v6.6/lib64/libUtils.so
These sections show that different parts of the same executable are linked to different versions of the library on the filesystem. I have the matching core dump file as well and my question is: Is it possible to determine which symbols in the executable code were linked at runtime to each version of the library from this memory mapping? Or maybe there is a way to do this from the executable itself? This executable makes direct use of the code on libUtils.so but also links other libraries that themselves may use libUtils.so. It is our guess that one of these is linking to the v6.6 instance instead of the release instance and we are trying to track it down. An ldd -rv of the executable shows both listed but not enough to figure out where they came from. We know the release version came from direct compilation and linking of the executable but we are trying to track down where the v6.6 instance got pulled in. Trimmed down output of ldd -rv: **/devel/utililty/release/lib64/libUtils.so (0x00007f0576b29000)** liblog4cplus-1.1.so.9 => /lib64/liblog4cplus-1.1.so.9 (0x00007f0575fcb000) libsigc-2.0.so.0 => /lib64/libsigc-2.0.so.0 (0x00007f0575b8e000) libGL.so.1 => /lib64/libGL.so.1 (0x00007f057479a000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f057457e000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f0574276000) libm.so.6 => /lib64/libm.so.6 (0x00007f0573f73000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f0573d5d000) libc.so.6 => /lib64/libc.so.6 (0x00007f057399a000) libboost_thread-mt.so.1.53.0 => /lib64/libboost_thread-mt.so.1.53.0 (0x00007f0573782000) libboost_system-mt.so.1.53.0 => /lib64/libboost_system-mt.so.1.53.0 (0x00007f057357e000) **libUtils.so => /devel/utility/v6.6/lib64/libUtils.so (0x00007f05730a1000)**
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| UIO instance of a device-tree subnode Posted: 09 Feb 2022 09:59 AM PST I have the following device-tree node which is auto generated by Xilinx PetaLinux in a proper dtsi file (which cannot be modified): axi_dma_0: dma@a0000000 { #dma-cells = <1>; clock-names = "s_axi_lite_aclk", "m_axi_sg_aclk", "m_axi_s2mm_aclk"; clocks = <&misc_clk_0>, <&misc_clk_0>, <&misc_clk_0>; compatible = "xlnx,axi-dma-7.1", "xlnx,axi-dma-1.00.a"; interrupt-names = "s2mm_introut"; interrupt-parent = <&gic>; interrupts = <0 89 4>; reg = <0x0 0xa0000000 0x0 0x10000>; xlnx,addrwidth = <0x28>; xlnx,include-sg ; xlnx,sg-length-width = <0x1a>; dma-channel@a0000030 { compatible = "xlnx,axi-dma-s2mm-channel"; dma-channels = <0x1>; interrupts = <0 89 4>; xlnx,datawidth = <0x20>; xlnx,device-id = <0x0>; }; }
To give access to the whole AXI DMA hardware from UIO, the following code can be used from another custom file that PetaLinux accounts for: &axi_dma_0 { compatible = "generic-uio"; linux,uio-name = "axi_dma"; };
What I would like to do is to give UIO access only to the dma-channel sub-node instead of the whole AXI DMA. To do this I tried something this: &axi_dma_0 { dma-channel@a0000030 { compatible = "generic-uio"; linux,uio-name = "axi_dma_s2mm"; }; };
Or adding reg space declaration to dma-channel subnode: &axi_dma_0 { dma-channel@a0000030 { reg = <0x0 0xa0000030 0x0 0x28>; compatible = "generic-uio"; linux,uio-name = "axi_dma_s2mm"; }; };
Among others... I cannot make it to create the /dev/uioX file.. What is wrong or what am I missing to make it work, or understand why it is not possible (if so) ? |
| Explanation of pipeline containing egrep, tr and expand Posted: 09 Feb 2022 11:48 AM PST Can someone explain the following pipeline to me? I am trying to filter a list of ports in services so that only the unique port names are listed out. What exactly do expand and tr do, and what does the regular expression used with egrep do? expand regexAufgabe | egrep -v '^#|^$' | tr -s ' ' | cut -d ' ' -f2 | cut -d / -f2 | sort | uniq
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| /git: permission denied Posted: 09 Feb 2022 09:35 AM PST I couldn't find a solution to this error so I reinstalled the OS, that takes me 30 minutes and I was expecting it to solve the problem, but it persists. Whenever I try a git init in any empty repository I get /git: permission denied. Which doesn't tell me anything. Then only files I've copied after reinstalling Manjaro Cinnamon 21.2.2-220123-linux515 are the ones I keep in the Sync directory where I have my dotfiles. In the dotfiles I have some git configuration but I don't think that would be causing the issue. |
| Why is Zorin OS so full of bugs? Posted: 09 Feb 2022 09:31 AM PST I have Zorin OS 16, x64, with X11 windowing system, and I am using full disk encryption by the way, and am using a Dell Latitude E5450 laptop. I really love few things about the OS, and some of the benefits of using Linux, but I am experiencing various annoying glitches and crashes, and I was wandering why, and should I switch to Ubuntu instead? Here are some of the issues I have been experiencing: Bootloader menu not intuitive and some options disabled - leading to erasing windows by accident instead of making a dual-boot. Not being able to cut/copy/paste files from desktop to a different drive Not being able to open files on another drive in wine applications Can't change file view type (list, large, details, etc.) per folder, but for the entire file manager There is no filetype column to sort by Only 2 types of viewes - list and icons, although this is nod a bug but a poor design Drag and drop to the taskbar doesen't work Can't copy paste to other drive, need to drag drop in window Desktop lost icons and right click not working either, after saving 20-30 files on desktop Firefox sometimes crashes the OS and need shut down with PC button Firefox tab made the system unresponsive and needed Shut down with PC button Wine app Notepad++ and possibly other non wine apps constantly generate .bak files that often persist even after closing the document and get in my way all the time Wine app Notepad++ - "find" window tabs are broken "Ctrl+F" (although still useable) Text editor froze for a time after initiating save operation on a small text file "Ctrl+S" OS unresponsive to all clicks or "Alt+Tab", only mouse cursor is moving. Resolved after ~30 sec QBittorrent is unresponsive when I open torrent file with open with from browser and in some cases needs to be closed and the action done again Firefox window was small and unresponsive after update, opening w 6 tabs. Needed to close it and wait a minute for it to close After automatically openning last tabs (6 tabs) firefox is in a window mode and button highlighting is offsetted from the mouse cursor by a significant ammount, thus one needs to point to the left and top of the desired location. Fixed after maximizing the window manually Blobby volley game arrows don't react always Wine app notepad++ has 2 icons on taskbar Annoying .bak files being created all the time Default video player seekbar stopped moving with the cursor, authough sliding on it still moves the video, just the seek bar does not reflect it VLC player won't start and when started via the special icon on the right of the task bar, won't play video files Touch pad stopped working, had to do with the knob and restart the OS
And those are just the most, and this is in the span of a month or so, so everyday there is something new to annoy me. This is not normal for Linux, right? |
| Select first n words of each line of a file Posted: 09 Feb 2022 10:30 AM PST Using sed or awk, I want to select the first n words of each line of a file. I have a file with three lines, say one two three four one two three four one two three four
and I want the output file to be the first, say, two words of each sentence: one two one two one two
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| Why Aptitude package manager is not as popular as APT? Posted: 09 Feb 2022 09:21 AM PST Let me admit that my opinion in the question may be wrong. (Aptitude may be actually popular by users than APT, unfortunately I did not find robust data about usage.) But, wherever I see, let's say, official documentations, manpages, installation instructions, tutorials and videos, I mostly see the mention of APT. Aptitude, on the other hand, has a very few mentions. When tried to see some technical comparisons, I almost always came across the argument that Aptitude is better than APT. It's dependency resolver is more robust than APT and it represents information in beautiful way. APT lacks some of these features. Even it has these plus points, Aptitude is not shipped by default on any Debian/Ubuntu based distros, and is not mentioned anywhere either. Also, whatever technical comparisons and mentions of Aptitude I found on internet, are very old. (Almost 6 to 10 years old..!) It seems that very very few people advocate Aptitude nowadays. So my question is, why more and more people are endorsing and promoting APT and not Aptitude ? What are some technical constraints of Aptitude ? In the end, distribution vendors may have some genuine reasons for this thing. Does anyone know ? |
| After reinstalling NetworkManager internet connection is not working. Only dhclient usb0 works. VPN connection says it's connected but it's not Posted: 09 Feb 2022 11:02 AM PST I had a problem with dropping internet and vpn connection on ubuntu 20.04. Because of that i decided to reinstall network manager according to this anwser. I executed following commands sudo apt-get purge network-manager sudo apt-get update sudo apt-get autoremove sudo apt-get upgrade sudo apt-get install network-manager sudo apt install ubuntu-desktop
then rebooted the system and after that i can't connect to the internet. My modem is Android device with tethering enabled (internet connection has been working properly before executing commands that i listed above). Connection is visible on the ubuntu GUI (top right corner) and is named "USB Ethernet Connected". Despite of that internet is not working. I found that i can execute dhclient usb0 and after that internet is working properly but i have to do it every time i boot up the system. Also i can't connect to VPN network (there is no error, GUI says it's connected but servers available only in VPN network are not accessible). There is my ifconfig docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255 ether 02:42:25:93:e5:82 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 docker_gwbridge: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 172.19.0.1 netmask 255.255.0.0 broadcast 172.19.255.255 inet6 fe80::42:c3ff:fe60:668a prefixlen 64 scopeid 0x20<link> ether 02:42:c3:60:66:8a txqueuelen 0 (Ethernet) RX packets 495 bytes 47231 (47.2 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 520 bytes 80963 (80.9 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 enp3s0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 4c:ed:fb:95:c7:9f txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 5192 bytes 487445 (487.4 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 5192 bytes 487445 (487.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.42.109 netmask 255.255.255.0 broadcast 192.168.42.255 inet6 fe80::e097:241:56b:9a3a prefixlen 64 scopeid 0x20<link> ether 92:28:29:5f:bf:6c txqueuelen 1000 (Ethernet) RX packets 5 bytes 1058 (1.0 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 249 bytes 32661 (32.6 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth05b6c07: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::782e:6ff:fe4a:bdb9 prefixlen 64 scopeid 0x20<link> ether 7a:2e:06:4a:bd:b9 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 48 bytes 6509 (6.5 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth0ba13b0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::1cc9:c1ff:fef2:b783 prefixlen 64 scopeid 0x20<link> ether 1e:c9:c1:f2:b7:83 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 47 bytes 6425 (6.4 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth0c2d06c: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::286c:9dff:fe62:d6b8 prefixlen 64 scopeid 0x20<link> ether 2a:6c:9d:62:d6:b8 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth0e104e0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::ac61:95ff:feb6:f31b prefixlen 64 scopeid 0x20<link> ether ae:61:95:b6:f3:1b txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth1b2a54a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::8c1c:f4ff:fec1:3097 prefixlen 64 scopeid 0x20<link> ether 8e:1c:f4:c1:30:97 txqueuelen 0 (Ethernet) RX packets 495 bytes 54161 (54.1 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 519 bytes 80611 (80.6 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth1e723d5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::c463:b3ff:fe4e:992c prefixlen 64 scopeid 0x20<link> ether c6:63:b3:4e:99:2c txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth20ad462: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::7cf1:a6ff:fe67:bd5 prefixlen 64 scopeid 0x20<link> ether 7e:f1:a6:67:0b:d5 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth2b1261a: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::2091:6eff:fe36:6915 prefixlen 64 scopeid 0x20<link> ether 22:91:6e:36:69:15 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth3575eea: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::94f8:e5ff:fed1:3f13 prefixlen 64 scopeid 0x20<link> ether 96:f8:e5:d1:3f:13 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth48f5a22: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::d8e6:fcff:fe3f:c003 prefixlen 64 scopeid 0x20<link> ether da:e6:fc:3f:c0:03 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth4f510a3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::a870:e1ff:feb9:9cca prefixlen 64 scopeid 0x20<link> ether aa:70:e1:b9:9c:ca txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 77 bytes 10671 (10.6 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth6ca5384: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::80ce:94ff:fe2f:8c8e prefixlen 64 scopeid 0x20<link> ether 82:ce:94:2f:8c:8e txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth7249d81: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::5c70:7fff:fe9d:54a4 prefixlen 64 scopeid 0x20<link> ether 5e:70:7f:9d:54:a4 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth875ed12: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::1047:dfff:fef6:d885 prefixlen 64 scopeid 0x20<link> ether 12:47:df:f6:d8:85 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 veth88216b5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::98bf:c5ff:fe8f:ef44 prefixlen 64 scopeid 0x20<link> ether 9a:bf:c5:8f:ef:44 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6098 (6.0 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 vetha5da662: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::9c6d:36ff:fefa:4fdc prefixlen 64 scopeid 0x20<link> ether 9e:6d:36:fa:4f:dc txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 vethb219fc4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::a427:5ff:fe2a:de36 prefixlen 64 scopeid 0x20<link> ether a6:27:05:2a:de:36 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 vethb58896f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::80e9:50ff:fe61:aee7 prefixlen 64 scopeid 0x20<link> ether 82:e9:50:61:ae:e7 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 48 bytes 6509 (6.5 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 vethdceb1ac: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::387d:c8ff:fea5:4926 prefixlen 64 scopeid 0x20<link> ether 3a:7d:c8:a5:49:26 txqueuelen 0 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 44 bytes 6115 (6.1 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
There is my /etc/network/interfaces file (originally after reinstallation of network manager it was empty but i added it in the mean time) # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface # auto lo # iface lo inet loopback # The primary network interface # auto usb0 # iface usb0 inet dhcp
There is my netplan configuration (only /etc/netplan/01-network-amanger-all.yaml is there) # Let NetworkManager manage all devices on this system network: version: 2 renderer: NetworkManager
and /etc/NetworkManager/NetworkManager.conf [main] plugins=ifupdown,keyfile [ifupdown] managed=true [device] wifi.scan-rand-mac-address=no [keyfile] unmanaged-devices=*,except:type:wifi,except:type:wwan,except:type:ethernet
I would like to have working internet after booting up the computer and working VPN connection. I would be glad for any explanations why it stopped working, what can i do and where i can read more about network configuration in Ubuntu. EDIT #1 It seems that executing below commands fixed internet connection on system boot but VPN is still not working. apt install resolvconf systemctl enable systemd-resolved.service service systemd-resolved start
EDIT #2 After executing sudo apt-get install --reinstall ubuntu-desktop and rebooting the machine VPN configuration can be edited and I can connect to VPN but i can't access any server by it's DNS name. EDIT #3 Issue has been resolved following this tutorial |
| Rename file by moving middle string to end of the file Posted: 09 Feb 2022 11:26 AM PST I have some data files and I wish to rename them for my pipeline. The files look like this: {unique_ids}_{experiment_condition}_L{3_digit_number}.txt
I need to rename them so the experiment condition flag will appear at the end of the file, before the extension as follows: {unique_ids}_L{3_digit_number}_{experiment_condition}.txt
Length of unique_ids and experiment_codition is not fixed. Example: ghad312fd2_Mb_L002.txt becomes ghad312fd2_L002_Mb.txt.
Thank You! |
| Extract lines from one file containing words listed in another file Posted: 09 Feb 2022 10:05 AM PST I have two files, file1.txt and file2.txt. In file1.txt I have 4 thousand lines of single string words and in file2.txt I have 498 sentences. I want to grep file2 with the contents in file1 and if that string from file1 is found in file2 print the match. I have tried grep -f and grrp -Ff, but all it does it print the contents of the files. file1.txt something somthingelse maybe ok yes
file2.txt Hello there how are you Here is another line ok Nothing to see here maybe Nope not here yes
Expected output Here is another line ok Nothing to see here maybe yes wc -l file1.txt file2.txt 4000 file1.txt 498 file2.txt 4498 total
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| partitioning, subpartitions Posted: 09 Feb 2022 10:52 AM PST A hard drive with multiple partitions gets dd'ed onto a partition of a second hard drive (partition big enough to fully contain the first hard drive). Is it possible to access the data on the second drive - and if, how? Edit: For clarification - I guess a better term for the problem would be "nested partition(s)":  Which also led me to this answer: Is there a way to allow nested partition tables? - my use case would be similar to the last paragraph, and probably a solution would be to use device mapper. But it seems there is no "easier" way to access the data. |
| Debian doesn't show wifi connection Posted: 09 Feb 2022 11:12 AM PST I installed debian on an old Toshiba laptop and did everything through LAN. But now I saw that wifi is totally missing. Searching online I found that my output of pci -nn | grep -i network might be useful: 06:02.0 Network controller [0280]: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection [8086:4220] (rev 05)
I tried to re-install wireless-tools and firmware-iwlwifi and network-manager but nothing works, help me please.
Thanks in advance. |
| Zeroing bytes to linux dos not working with LVM(XFS) volume Posted: 09 Feb 2022 09:28 AM PST I'm running a CenOS7 on VirtualBox and need to reduce the VDI file. Firstble I need clean the free space using zerofree,trim, dd, etc... I tried to use both (DD and FSTRIM) to clean IT but after a few tentatives the VDI file continues with a huge difference. Any light about why does not working? System Info's: Zabbix/PostgressDB server FS: xfs Volume: LVM
commands used at the guest: - dd if=/dev/zero of=/storage/zerofile bs=4096k; rm -f /storage/
- fstrim -av
command used at the host - modifyhd 'file.vdi' --compact
- Optimize-VHD 'file.vdi' -Mode Full
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| Unable to exclude lines containing ^M from grep Posted: 09 Feb 2022 09:24 AM PST I have the following file from which I want to extract only Removed '2022-01-30_01-00-05', at the end. Removing '2022-01-30_01-00-05'... 0.46% complete (00:03:45 remaining)^M 5.49% complete (00:00:17 remaining)^M 24.90% complete (00:00:06 remaining)^M 60.56% complete (00:00:01 remaining)^M 82.12% complete (00:00:00 remaining)^M 82.39% complete (00:00:01 remaining)^M 84.24% complete (00:00:01 remaining)^M 86.48% complete (00:00:01 remaining)^M 88.58% complete (00:00:01 remaining)^M 89.66% complete (00:00:01 remaining)^M101.08% complete (00:00:00 remaining)^M104.62% complete (00:00:00 remaining)^M ^MRemoved '2022-01-30_01-00-05'
I've tried dos2unix but it didn't work. I've tried these variations, below, but when I less output they either don't remove the ^M characters, or the whole line is captured: tr -d $'\r' < /file | grep "Removed" > output tr -d '^M' < /file | grep "Removed" > output tr -d ^M < /file | grep "Removed" > output sed 's/\r//g' < /file | grep "Removed" > output
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| What does KDE Compositor Tearing prevention ("vsync") do under the hood? Posted: 09 Feb 2022 12:00 PM PST I have screen tearing issues. When I set Tearing prevention ("vsync") in Compositor to something else and then back to Automatic the screen tearing is gone. I would like to know what configuration files Tearing prevention ("vsync") changes to troubleshoot this problem and find a permanent fix. I test for screen tearing with this video. I also have screen tearing with the latest live iso with both free and non-free drivers. Operating System: Manjaro Linux KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.70.0 Qt Version: 5.15.0 Kernel Version: 5.6.16-1-MANJARO OS Type: 64-bit Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz Memory: 15,5 GiB of RAM GPU: Nvidia GeForce 940M
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| how can I call a script with spaces in a variable in zsh? Posted: 09 Feb 2022 09:52 AM PST this works as expected in bash: > t="ls -l" > $t #== ls -l > "$t" #== "ls -l" ls -l: command not found
But in zsh I got this: > t="ls -l" > $t #== "ls -l" ls -l: command not found
How can I force the shell to parse the variable value again like bash does? |
| gpg: keyserver receive failed: Server indicated a failure Posted: 09 Feb 2022 11:33 AM PST This error has arise when I add gns repository and try to use this command: #sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F88F6D313016330404F710FC9A2FD067A2E3EF7B
the error is: gpg: keyserver receive failed: Server indicated a failure
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| Fingerprint reader on Asus Zenbook Posted: 09 Feb 2022 10:05 AM PST So I have ZorinOS installed on my ASUS ZenBook UX330UA-AH54, however, FingerprintGUI shows my fingerprint sensor (Elantech I think) as an unknown device. Is there any custom software or fixes that can be used to get my laptop to pickup the fingerprint sensor? |
| Bash shell launched by forkpty() spawns child processes that ignore SIGINT. Why and how do I ensure SIGINT is not ignored? Posted: 09 Feb 2022 11:02 AM PST I have a C program that uses forkpty to execute a bash shell. I'm finding that the programs launched by this shell are launched with SIGINT ignored, so when I send a Ctrl-C to the shell they never close. example: int masterFd; char* args[] = {"/bin/bash", "-i", NULL }; int procId = forkpty(&masterFd, NULL, NULL, NULL); if( procId == 0 ){ execve( args[0], args, NULL); } else { // Simple code that reads from standard in and writes to masterFd. // I also register for Ctrl-C and write it to masterFd if caught }
Other control characters seem to make it through, ctrl-D, ctrl-? etc. However, whenever I look at the status of a process launched by the new bash shell it appears as if SIGINT is masked out. MyShell:# sleep 1000 StandardTerm:# ps -ef | grep sleep root 26611 19278 0 17:44 pts/1 00:00:00 sleep 1000 root 26613 32376 0 17:44 pts/1 00:00:00 grep sleep StandardTerm:# grep Sig proc/26611/status SigQ: 0/256428 SigPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000010006 <- THE 6 IS THE PROBLEM SigCgt: 0000000180000000
SigIgn has the 2 bit set, which means 2 (SIGINT) is ignored. if I do the exact same thing, but run sleep (or cat a giant file or whatever) in a standard terminal, this bit is cleared. What am I doing when I launch my pty bash that is causing it to create grandchildren programs with SIGINT ignored? Moreover, if I send a SIGINT signal to the process StandardTerm:# kill -2 26611
nothing happens. What's strange is when I send the same command to the bash shell I forkpty'ed IT works, because that bash shell is not ignoring SIGINT. |
| Edited sudoers file with text editor - now can't run sudo Posted: 09 Feb 2022 11:01 AM PST I now know that I should never try to edit the etc/sudoers file with a regular text editor. However, minutes before I learned this, I saved a new user name in the file with Sublime Text. Now when I run sudo cat sudoers for example, I get the following error: >>> /etc/sudoers: syntax error near line 1 <<< sudo: parse error in /etc/sudoers near line 1 sudo: no valid sudoers sources found, quitting
How can I get out of this quandary? |
| How do I test if an item is in a bash array? Posted: 09 Feb 2022 12:05 PM PST Help for a simple script #!/bin/bash array1=( prova1 prova2 slack64 ) a="slack64" b="ab" if [ $a = $b ] then echo "$a = $b : a is equal to b" else echo "$a = $b: a is not equal to b" fi
This script simply doesn't work, I want a script which check if slack64 is present in a list(i use an array),and simply give me, yes is present,or no. I don't know how to compare an array with a single variable. |
| How to stop the loop bash script in terminal? Posted: 09 Feb 2022 09:23 AM PST For example, #!/bin/bash while : do sl done
How to terminate this bash script? |
| Get path of current script when executed through a symlink Posted: 09 Feb 2022 11:21 AM PST I have a utility consisting of a couple of directories with some bash scripts and supporting files that will be deployed to several machines, possibly in a different directory on each machine. The scripts need to be able to reference paths relative to themselves, so I need to be able to get the path to the file that's currently being executed. I am aware of the dirname $0 idiom which works perfectly when my script is called directly. Unfortunately there is a desire to be able to create symlinks to these scripts from a totally different directory and still have the relative pathing logic work. An example of the overall directory structure is as follows: / |-usr/local/lib | |-foo | | |-bin | | | |-script.sh | | |-res | | | |-resource_file.txt |-home/mike/bin | |-link_to_script (symlink to /usr/local/lib/foo/bin/script.sh)
How can I reliably reference /usr/local/lib/foo/res/resource_file.txt from script.sh whether it is invoked by /usr/local/lib/foo/bin/script.sh or ~mike/bin/link_to_script? |
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