Questions tagged [bash]
Bash is a free shell for Unix-like operating systems from the GNU Project.
11,856 questions
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How to redirect the standard output to file without buffering?
I have a Python script test.py, which writes 100 lines, one per second:
from time import sleep
for i in range(100):
print(f'line {i}')
sleep(1)
I would like to redirect its output to log.txt ...
- 211
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0
answers
23
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How to use abbreviations in bash prompt [duplicate]
Can abbreviations (like the ones in fish or vim) be used/implemented/configured in bash?
By abbreviations i mean something similar to alias but it's exanpded directly in the prompt so that I can ...
- 67
1
vote
1
answer
29
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Advanced argument escaping with find + xargs and nested commands
I know when you run into problems with piping the output of e.g. find .. to xargs due to 'strange' filenames, it can help to use a specific delimiter (e.g. \0) to actually pass full filenames (e.g. ...
- 1,139
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39
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bash: "no such file or directory" for executable in PATH
In my process of installing java (as part of weblogic) with ansible I get this issue. I have seen that before from time to time, but cannot recall the solution.
I have a new linux user "weblogic&...
- 338
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49
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Why does Bash alias named “l” fail but works if the alias name is changed to “lf?”
When I put this line in my .bash_aliases:
l() { pwd; ls -aoghs --author --color=always "$@"; echo `pwd` "$@"; }
I get this error:
bash: /root/.bash_aliases: line 4: syntax error ...
- 101
5
votes
3
answers
291
views
Delete directories containing only .directory files
I have done a lot of cleanup by removing files in a directory tree. I would now like to delete the empty directories as there are now a lot of 'almost empty' directories: they contain only a hidden ....
- 331
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0
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30
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Store bash glob pattern in a variable
I can use syntax as below to list 6 files named a1b.md, a2b.md, a3b.md, x1y.md, x2y.md, x3y.md in a directory:
ls a{1,2,3}b.md x{1,2,3}y.md
I'd like to use something like this in a bash script; with ...
- 343
1
vote
1
answer
38
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How to create a bash one-liner activating Python virtualenv?
I need to have a one-liner, which activates a Python environment and runs a Python script. None of my attempts worked:
bash --rcfile /opt/venv/bin/activate -ci "echo $VIRTUAL_ENV"
bash -c &...
- 141
1
vote
1
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82
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Exit code of a bash script when one of the steps fails?
So I have to run a basic shell script that is not much more than:
#!/bin/bash
call01
call02
...
call_N
If one of the calls fails (gets killed by the OS because it runs out of memory), what does it ...
- 159
1
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0
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36
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Move files recursively until specific name is reached?
I have a very large amount of files on a desktop that I'm trying to transfer to my laptop. I set up a Sambashare directory on my desktop, mounted it on my laptop, and started copying them. However, ...
- 11
1
vote
1
answer
99
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How to redirect output to both a file and stdout?
I have found multiple answers on the internet for variations on what I am after. None provide the exact solution.
Specifically, I have a function func, which internally runs a make process. I have no ...
0
votes
1
answer
29
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iTerm 3.5 & Bash 5.2 prompt "shifting" where cursor shifts to right and is partially invisible [duplicate]
An odd issue I'm seeing with iTerm 3.5.10 and a Raspberry Pi 5 running Debian Bookworm 64-bit.
I'm ssh'd in using iTerm and if I have a relatively long command in my command history, hitting the up-...
- 111
1
vote
1
answer
29
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Starting multiple iperf server instances with gnome-terminal
I want to use a script in Linux to start multiple instances of iperf3 as server like this:
gnome-terminal -e --bash -c "iperf3 -s -B 10.10.1.1 -p 5021"
gnome-terminal -e --bash -c "...
- 13
-1
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0
answers
42
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Locking out user from sudo commands without rebooting [duplicate]
A more in depth explaination would be found here.
The use case of what I'm trying to do is:
You login to your desktop Linux computer.
You start a script and as input you give to it a time in the ...
0
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1
answer
71
views
How to manually close ssh ports / port bindings?
I work on a mac 15.1 system and open a connection to a jumpserver for having the option to connect to several other servers.
Usually the script works like a charm, but sometimes it gets stuck and ...
- 123
0
votes
3
answers
76
views
Display relative date with `date` in human-readable format
I have date that I know will always be in future by at least one second.
Then I calculate difference between date now and target date in seconds.
But I can't figure out how to display second ...
- 123
1
vote
0
answers
33
views
Must ssh-add two times when over SSH
I am on an Ubuntu machine. When I login normally from my desktop, my SSH credentials are added automatically and everything works correctly.
However, when I instead work remotely via SSH, initially at ...
- 133
0
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0
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19
views
How to get Variable from bash script to ocs_prerun Clonezilla options?
I don't see much in the way of Clonezilla questions, and have spent hours googling - nothing seems to answer my question - several SourceForge articles come close, but then the "answer" is ...
- 129
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1
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28
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How to exit timed out SSH session without exiting earlier jumps?
I am aware I can type exit, logout, or hit Ctrl-D to logout normally. None of this works when the server is timed out, but thankfully I can do Enter-~-. to exit the session.
However, this takes me all ...
- 1
2
votes
1
answer
96
views
Bash Script Fails to Find and Update Specific Line with `grep` and `sed`
I'm writing a simple script to add Wayland support options to specific application files. The script uses grep to check for a line, and sed to add options to it if the options are missing. However, I'...
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1
vote
1
answer
46
views
Where is the path of slurmd binary in a HPC system?
I want to find the path of slurmd binary in a HPC system. I used which slurmd but there was an error:
/usr/bin/which: no slurmd in
(/opt/xcat/bin:/opt/xcat/sbin:/opt/xcat/share/xcat/tools:/opt/ohpc/...
- 11
1
vote
0
answers
64
views
Cannot use arrow keys with BASH / Konsole / sqlite
I'm having a problem with Bash / Konsole / sqlite. When I enter sqlite and hit the up arrow key I get
sqlite> ^[[A
If I su into another user from the same Konsole session all is OK.
I've looked at ...
- 111
1
vote
1
answer
31
views
“multidimensional expansion” with brace expansion in Bash?
I think my use case is best illustrated with a concrete example, say with imagemagick:
magick \( source_file_A1.jpg source_file_A2.jpg +append \) \
\( source_file_B1.jpg source_file_B2.jpg +append \) \...
- 361
0
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0
answers
88
views
expect script inside bash doing remote ssh /etc/sudoers replacement
I am having issues with the below script. I am trying to replace a line in /etc/sudoers file but need to do it using sudo and either input my password or as in example here, put it in a variable.
#!/...
- 1
1
vote
1
answer
39
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Run bash scripts on KDE Plasma sleep and wakeup events of Power Management as a particular user?
KDE Plasma 5.27.11 on Debian 12 amd64
I need to send some very short signals over USB on workstation's power management sleep and wake up events(not login and log out, they work fine). I have prepared ...
- 11
2
votes
1
answer
144
views
How to set a global variable from a bash function when its output is piped to another command
Let us define this very small bash function:
function testit() {
a=4
echo "Hello world"
}
if I run the function, then variable a will take the value 4 (which is the expected outcome):
...
- 123
0
votes
1
answer
33
views
chroot to /mnt fails, when it shouldn't
I'm currently attempting to install GRUB on a disk image, for testing in QEMU. To generate the GRUB configuration file, you need to chroot into /mnt (as per this previous answer) and then run grub-...
- 103
0
votes
1
answer
221
views
bash: java: command not found
My Linux distro is Debian 12.7.0, 64bit, English.
I modified the guide titled How to install Java JDK 21 or OpenJDK 21 on Debian 12
so that I could "install"/use the latest production-ready ...
- 23
0
votes
1
answer
30
views
bash and find: how to modify a path name from the lowest level up
I run the following command to recursively rid folders of characters that pose problems with certain apps, scripts, or on NFS/SMB, i.e., change ' to ’, ? to ？ (chinese char), : to ： (chinese char), ...
- 151
0
votes
0
answers
57
views
ffmpeg overlay rounded corner webcam video on main video
I am trying to overlay a webcam video on top of the main video and have the webcam video rounded corners and place it at the bottom left corner of the main video. I want the webcam video to scale down ...
- 1
1
vote
1
answer
102
views
Issue with Activating Virtual Environment in Shell Script on Raspberry Pi via Remote-SSH
I am connected to my Raspberry Pi 4B via Remote-SSH using Visual Studio Code on Windows 10. I wrote a shell script venv.sh remotely from my Windows machine:
#!/bin/bash
# Activate the virtual ...
0
votes
2
answers
52
views
What happens if I run this `set` command intended for Windows cmd prompt inside Bash in Linux?
What happens if I run this set command intended for Windows cmd prompt inside Bash in Linux?
set "PATH=C:\Program Files\Git\bin;%USERPROFILE%\AppData\Local\Programs\Git\bin;%PATH%"
echo %...
- 2,428
-2
votes
2
answers
59
views
i am not able to print sum of two columns from a live stream of data using awk
so i am trying to monitor how much bandwidth get used by transmission while torrenting. I searched and find an utility nethogs.if i run
sudo netogs -t | grep transmission-gtk
i get
transmission-gtk/...
0
votes
1
answer
144
views
Unzip to stdout with filenames and file delims
I have a tar which contains many zip files, each of which contains xml files. I would like to untar, unzip, and then do some stuff with the plaintext in the xml files. This entire program is being ...
0
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0
answers
73
views
How can I automatically remove all of a single audio track from an MKV and then verify that the audio track has been removed?
This is a bit of a multi-part question, so please bear with me.
My NAS is filling up with TV shows, so for the purposes of saving space, I'm trying to remove all dubbed audio tracks from my multi-...
- 1
1
vote
2
answers
106
views
How to write to last 4 bytes of disk via CLI? Like using dd, optional
Warning,
these commands (scripts) delete (change) data on your disk.
Be sure to back up any important data on disks/drives before proceeding.
You are responsible for lost data.
You can use
blkid
lsblk
...
- 499
0
votes
1
answer
26
views
bash completion, can one set a default word for first tab on a new terminal line
I have a container that the shell therein runs bash. It has bash completion installed and it works fine. This container has many custom cli commands but they all must be prefaced with nextcloud. ...
- 268
1
vote
0
answers
78
views
How can I cap video length to just slightly below 60 seconds without re-encoding with FFmpeg?
I'm currently making a script to cap my videos at just slightly below 60 seconds. So if I have a video clip that is exactly 60 seconds long, I trim it by exactly 1 frame so it is slightly below 60 ...
- 177
0
votes
0
answers
45
views
bash tab completion doesn't work with source
When there's executables in my ~/bin folder, I can usually type part of it, for example "my_", and then hit tab so it auto completes to become "my_executable". However, when ...
- 215
0
votes
0
answers
29
views
miniset instalation error i: invoke-rc.d: initscript openvswitch-switch, action "start" failed
Overview
I'm using Ubuntu 22.04 in WSL2 and I need to install mininet program:
sudo apt install mininet
And the follow problem occurs:
pedro@DESKTOP-HNMS5UI:/mnt/c/Users/PedroFraga$ sudo apt install ...
- 1
0
votes
1
answer
27
views
Finding nested `vendor` folder
I'm searching for a specific nested folder.
This nested folder is in the form of **/**/vendor/**/**/vendor
I would like to find and delete this 2nd vendor
Any ideas?
- 229
0
votes
1
answer
116
views
Speed up reading a large number of files (random read)
I'm trying to run a bash script on all the xml files inside a folder. After some effort I found the likely bottleneck is reading the files, given the filenames. My script is likely running fast enough ...
0
votes
1
answer
52
views
What is the meaning of "%CPU" when using GNU `time` command
I doubt my understanding of the output from running the GNU time command is correct. I am now wondering what the CPU percentage actually indicates.
On macOS I have installed the GNU time utility gtime ...
- 446
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1
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91
views
How to spawn an Alacritty terminal from another Alacritty terminal that was spawn by Waybar
I'm using a Waybar module in an Arch Linux Hyprland setup, where my .config/waybar/modules.json is set as follows:
"custom/clusterteleport": {
"format": " Cluster ...
- 158
-1
votes
1
answer
120
views
How to open an HTML file with Visual Studio Code inside of a Docker container?
I'm in Visual Studio Code's terminal inside a Docker container.
How do open an HTML file in Visual Studio Code from the Bash terminal inside a Docker container?
- 27
0
votes
1
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983
views
Sudo apt update issue in Parrot OS 5.2
When I do sudo apt-get update in Parrot OS 5.2 I am getting this error. I also change the /etc/apt/sources.list but still getting the same issue.
My source list is:
deb https://deb.parrot.sh/parrot ...
1
vote
0
answers
29
views
find -type f -iregex '\.\/INPUT.*\.(mp4|avi)$' returns nothing, why? [duplicate]
I am on: GNU bash, version 5.2.26(1)-release (x86_64-pc-linux-gnu)
I'm trying to get a list of all my video files with the extension .mp4 and .avi, my understanding with regular expression and follow ...
- 11
2
votes
2
answers
159
views
Can I find from which directory a command was executed?
A command find . -type f was issued on one of our servers by one of our users and its currently running when viewed in ps aux.
How can I know from which directory was this command issued.
Does that ...
- 153
7
votes
2
answers
892
views
How can I make second argument path relative to the first on a command? [duplicate]
For example, let’s say that you want to copy a file like this:
cp path/to/the/file.txt path/to/the/file.copy
It’s very frustrating to write the path twice so is there something like this with a ...
- 81
2
votes
2
answers
178
views
How can I open a new Safari window with bash?
I'm working on a project that will let me open and close different pre-saved combinations of urls in different browsing windows. Since osascript/osascript/AppleScript or whatever they're calling it ...
- 21