Questions tagged [bash]
Bash is a free shell for Unix-like operating systems from the GNU Project.
11,762
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Script to auto execute creation of ssh tunnel
I'm a CS student, and still learning a lot of these things, and so please bear with me if I don't have a full grasp on what I'm trying here.
I'm on a Mac, connecting to a linux machine. I can set up ...
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1
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How to transfer a file to a remote host using parallel + ssh?
I am writing scripts to poll a large number of remote hosts over ssh using gnu parallel. I copy the script to them, run it and get the results. Right now I'm using two bundles parallel + scp to ...
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1
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SSH from A through B to C, using private key on B
Schematic:
ssh ssh
A ------> B ------> C
^ ^
using A's using B's
ssh key ssh key
Preconditions:
A is running ssh-agent
A can access B
B can access C
A can't ...
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1
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How to detect even or odd minutes in bash script
I need to detect whether the current minutes are even or odd regardless of the time zone !
I tried this according to answers from several sites:
#!/bin/bash
n=$(date +"%M")
r=`expr$n%2`
if [...
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How do I create an environment variable "openssl"
I know my question may sound stupid but there's some problem I've been fighting with for the last 2 days.
I have a few versions of OpenSSL installed on Ubuntu server.
The one which is desired is ...
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1
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exit code segment causes Bash prompt to freak out
My Bash prompt (based on mike kasberg's) generally works fine. But when I get an error code, and then write over to the next line, no newline is generated, so the text goes back over my previous ...
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Alias CMD command from WSL2 shell
I'm running WSL2 on Windows 10, and I want to be able to run a CMD command from it without exiting the Linux shell. Specifically, I want to do:
wmic diskdrive get Model,Manufacturer,Size,DeviceID,...
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21
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How do I detach a process from Terminal, entirely?
I use Tilda (drop-down terminal) on Ubuntu as my "command central" - pretty much the way others might use GNOME Do, Quicksilver or Launchy.
However, I'm struggling with how to completely detach a ...
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Delete pattern matching regex from sed capture group
I'm trying to remove all instances of '_(one number)' from certain strings in a file. So tig00000003_1 should become tig00000003 This is what my test file looks like:
##sequence-region tig00000001_732 ...
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How to Identify and Terminate Idle tmux Sessions on a Debian Server
I have a Debian server with multiple tmux sessions running. Some of these sessions are idle and not running any active processes. How can I identify and terminate all tmux sessions that are not ...
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Does bash support variable substitution in return statement?
Does bash support variable substitution in return statement?
From man bash:
return [n]
Causes a function to stop executing and return the value specified by n to its caller.
Is n allowed to be ...
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Specify passphrase when invoking ssh?
I'm trying to run a remote command using SSH in a script. Host1 is connecting to Host2 to run a command.
I've setup the public keys between the two hosts so I don't need to use a password to make the ...
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2
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1
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Provide argument while starting a service using systemctl
I have a service installed on an old server and it is started using;
service load-simulator start medium
The value medium acts as a profile of sorts. It can have values like low, medium, high, and ...
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1
answer
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Ignore certain changes in git diff
Is it possible to get a report from git diff or related commands that excludes a certain category of change?
I've been asked to review a change where a huge number of files have undergone the ...
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1
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Font size issue with xterms started through icewm's hotkeys
Recently got a new laptop with 1920x1080 monitor instead of 1366x768 on old laptop. All my many xterms suddenly smaller and text illegible. After investigation, decided easiest solution was an alias ...
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removing old BTRFS snapshots with bash
I'm trying to build my own little backup script, I want to use BTRFS snapshots and keep them for a while. Meanwhile, creating the snapshots is no longer a problem for me, but now I would like to ...
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How do I run multiple scripts within a script, even if one script fails
I have a simple bash script that executes a number of other scripts …
#/bin/bash
…
./update_artifact1.sh $ARTIFACT_VERSION
./update_artifact2.sh $ARTIFACT_VERSION
./update_artifact3.sh $...
CommunityBot
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179
votes
23
answers
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Add directory to $PATH if it's not already there
Has anybody written a bash function to add a directory to $PATH only if it's not already there?
I typically add to PATH using something like:
export PATH=/usr/local/mysql/bin:$PATH
If I construct ...
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489
votes
7
answers
260k
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What is the difference between executing a Bash script vs sourcing it?
What is the difference between executing a Bash script like A and sourcing a Bash script like B?
A
> ./myscript
B
> source myscript
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How do I install ImageMagick for MinGW on Windows 7?
Well... I have already installed MinGW32 (I don't know the version - installed in a folder named Git 2.4.4.2) on Windows 7, and I want to install ImageMagick to run some scripts like the follow:
echo &...
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ssh -t host1 ssh host2 "cat < /tmp/test.txt" – file not found
I'm trying to run cat < /tmp/test.txt on remote host host2 through host1. The file /tmp/test.txt exists on host2. I try:
# locally
ssh -t host1 ssh host2 "cat < /tmp/test.txt"
The ...
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2
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Copy shell configuration from one machine to another?
I've got login to another server where shell configurations are not like I would want. For example I don't see my username and CWD on prompt, and when I press arrow key, instead of giving last entered ...
CommunityBot
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6
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1
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cd <nonexistent_directory> in bash causes cd to different directory?
Ok, so I've been using Linux for 18 years and have never seen or heard of anything like this:
starting-forth$ ls
ch01/ ch02/ ch04/ ch05/ ch06/ text/
starting-forth$ cd ch07 # A directory I ...
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How could I have VScode on Windows 10 with the default terminal changed to WSL2 Ubuntu-24.04 like a native linux distro?
I'm trying to have inside VScode for Windows 10 (Microsoft Windows [versão 10.0.19045.4474]) options to change the terminal from default to another one such WSL2 Ubuntu 24.04.
I have installed ...
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6
answers
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bash: execute command given in commandline and don't exit
how do I specifiy a command on the commmandline of bash which shall be executed once inside the new bash after reading ~/.bashrc -- But all this without letting bash exit after the command is finished?...
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2
answers
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Monitor folder size
Is there a way to monitor and log folder size in Bash/Ubuntu? I'm running some computations and I need to know how much disk space they need. They may create some temporary folders for a few minutes/...
CommunityBot
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3
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2
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426
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bash see if element inside array is inside a different array
I am trying to test to see if an element inside an array exists. A test case is
array1=(a b c)
array2=(c d e)
for ((i=0; i < ${#array1[@]}; i++)); do
if [[ ${array1[$i]} == "...
0
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2
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awk string replacement - properly escape '&' character
I am working on one of our applications to update the docker image from using static configs for each environment to a single template using dynamic variable insertion with awk. Our Dockerfile calls a ...
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answers
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How can I find only the executable files under a certain directory in Linux?
How can I find only the executable files under a certain directory in Linux?
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tcpdump output to file not working
I'm trying to write the results of tcpdump to a text file. I am not interested in saving a pcap file to use later, I just need exactly what tcpdump returns in plain text (the ips and timestamps of ...
CommunityBot
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1
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Dealing with whitespaces in file names after git grep -l
I'm trying to run the script below and I'm struggling with pathspec error when the filename has whitespaces.
I have already read some other posts around here, but since I am not an expert I was not ...
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26
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Bash scripting: test for empty directory
I want to test if a directory doesn't contain any files. If so, I will skip some processing.
I tried the following:
if [ ./* == "./*" ]; then
echo "No new file"
exit 1
fi
That gives the ...
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select columns on cat command
I use a file as a little db table. The content is like this:
client1 john doe engineer cal
client2 jane doe nurse ny
client3 ali veli doctor ny
I want to find ...
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2
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Is it possible to have dropdown autocomplete select options in ZSH or Bash?
Is it possible to have dropdown autocomplete select options in the terminal with ZSH or Bash as shown in the image below? Here the regions(i.e. ap-northeast-1, ap-northeast-1 etc) are predefined
CommunityBot
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17
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3
answers
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How to force ls terminal command to show results in Bytes while I have set the default to ls -h in bash profile?
I am following the snippet here to improve my terminal command in Mac OSX.
It sets the default value of ls results to human-readable by exporting alias ls='ls -GFh' to bash profile file. This is very ...
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1
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Hide files and folders with same name
I ran into an issue where I had to restart my computer during a large extraction process involving many zip files :(.
All the zip files contain a folder that has the name of the zip file (minus .zip)
...
149
votes
6
answers
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How to prevent SSH from disconnecting if it's been idle for a while
I have a ssh connection to a machine which gets disconnected by that machine after 30 minutes of no user input. However, if I start something like top, the connection stays alive.
Since this is a ...
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1
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Resolve "permission denied" when executing .sh files on WSL 2 via windows explorer
I'm using this method to have .sh files in Windows Explorer execute using bash.exe:
"C:\Windows\System32\bash.exe" -c " \"./$(grep -oE '[^\\]+$' <<< '%L')\"; cd ~; bash;"
This works fine ...
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How to merge all mp3 files located in the same directory?
The command below used to work but stopped around ubuntu/kubuntu 20.04.
ls *.mp3 | sed -e "s/\(.*\)/file '\1'/" | ffmpeg -protocol_whitelist 'file,pipe' -f concat -i - -c copy output.mp3
...
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13
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What does 'source' do?
$ whatis source
source: nothing appropriate.
$ man source
No manual entry for source
$ source
bash: source: filename argument required
source: usage: source filename [arguments]
It exists, and it is ...
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2
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Send JSON using curl from bash script when JSON path supplied as variable
I just cannot understand why all my attempts failing. I try to use curl to send POST request with json to specific url when a path to JSON defined as variable:
#!/bin/sh
JSON_TMP=/home/aaa/jsons/...
CommunityBot
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1
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views
Loop record RTSP stream with VLC
I am able to save an RTSP stream to a .mp4 file using the following command:
/usr/bin/vlc -vvv rtsp://stream_address --sout=file/mp4:/home/test-$(date +"%Y%m%d%H%M%S").mp4 --intf dummy --...
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Why can’t I assign a requested address InspIRCd? “Reason: Cannot assign requested address”
I want to make an IRC server but when I run ./inspircd start it I get this. I turned off UFW and set up port forwarding, but nothing changes:
Inspire Internet Relay Chat Server, compiled on Jun 8 ...
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votes
10
answers
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How can I do a recursive find and replace from the command line?
Using a shell like bash or zshell, how can I do a recursive 'find and replace'? In other words, I want to replace every occurrence of 'foo' with 'bar' in all files in this directory and its ...
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How can I use a Bash-like shell on Windows?
I use Linux and a Mac, and I'll be teaching some command line stuff soon.
What can I install on Windows to give me a terminal window most similar to a basic Mac/Linux Bash shell?
I would like to ...
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Change the color of the Intel NUC 11 Power LED from a running process
On an Intel NUC (model Intel NUC11TNHi7), Ubuntu 20 LTS is installed. I want to be able to use a process (such as a bash script, python, library, etc.) to control the button LED such as from systemd ...
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0
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Need Clang version at least 16
I am tried to compile the Apache Doris on macOS 13.3.1 follow by this document: https://doris.apache.org/docs/install/source-install/compilation-mac/. When I run the bash build.sh command, shows error ...
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Bash prevent word splitting in array from command
I am using bash to get all of my directories with find . -maxdepth 1 -type d. I am then storing it in an array called selections. The issue is if a file has a space in it then i get some issues. When ...
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How to do a Proximity text search, 2 + words?
What is a Linux terminal command to do a Proximity text search?
Search a directory, recursively, for files that contain :
2 words or more within
99 characters of each other
any order of above words.
...
4
votes
1
answer
4k
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Tab Auto-Completion in Mac OS X when using sftp in terminal
i have been getting very frustrated lately since the readline functionality has been removed from MacOSX and Tab Auto-Completion doesn't work anymore.
So i was wondering if anyone knew a good ...
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