Questions tagged [bash]
Bash (Bourne-Again SHell), is the default interactive user shell used in Ubuntu. Use this tag for questions specific to Bash, as opposed to generic POSIX shells.
11,094
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xfconf-query not working in crontab
i have a script as follow /usr/bin/disable-sleep
#!/bin/sh
xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/blank-on-ac -s 0
now=$(date +"%D %T")
echo "disable sleep $now&...
- 121
-1
votes
0
answers
14
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Node / javascript script can't detect my node & npm versions and fails
I'm trying to run setup for Epic React.
The script includes this:
var spawnSync = require('child_process').spawnSync
// [removed: ... a bunch of useless stuff about colours]
console.log(color('info',...
- 99
0
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0
answers
132
views
Adapt systemd-resolve command to resolvectl
I upgraded my ubuntu to 22.04 and a script that routes the traffic of my work vpn is not working properly since it uses a systemd-resolve command.
How I use the script: I manually execute a script (...
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29
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How to print command and then 5 live lines of command?
When I'm building a docker image, it prints the current RUN command, and a 5 or 6 line summary with the latest live output from that command.
Is there an easy way to do this but for a bash script? I ...
- 133
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1
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81
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Bash script does not recognize commands (Perl and Python scripts)
I have this script in bash inside which is defined to use perl and python for subprograms that need to analyze my data.
Script is executing fine until Step3 and Step4 and crashes with command not ...
3
votes
2
answers
775
views
How (abc) is parsed in bash
I'm using a program designed for windows that I compiled myself for GNU/linux. The program works in the command line, and one argument looks like this:
prgm -arg1 abcd(10)(22) -i files.ext
Where (10) ...
- 195
-2
votes
1
answer
43
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cli commands to fetch and set ubuntu settings? [duplicate]
Is there a pair of 2 commands that I can use to 1. store the current ubuntu settings (the ones that you can change by going to the top right and clicking settings) into some kind of my_settings file, ...
- 109
0
votes
1
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38
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Exit cron job after launching program
I have this .sh script that I want to execute once a day as a cron job. It checks if a specific process is still running (qbittools) and if not launches it again. This works, however the cron job ...
- 101
0
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0
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55
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Unable to resume from suspend due to zsh as default shell - why?
I've been bothered by a problem where my workstation won't resume from suspend. When the PC is powered the power button is fully lit, and when it's suspended the button is blinking. Pressing the power ...
0
votes
1
answer
24
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`expr: non-integer argument`
num1=20
num2=5
echo $( expr $num1 + $num2 )
I ran this code but it shows this error message.
What can I do to solve this?
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0
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29
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Adding chapters to mp4 using bash script and ffmpeg
I'm trying to add chapters to an mp4 file using bash and ffmpeg. The chapters are located in a file called chapters.txt. When the bash script is run which is called add_chapters.sh it reads the ...
- 2,191
0
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1
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37
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Why is my .bashrc caching curl when using as command substitution $(curl -s http://someurl.com)? [duplicate]
Here is an alias I made on my ~/.bashrc:
alias rand="echo $(curl -s https://whatthecommit.com/index.txt)"
If you enter this url, it simply returns a random message every request, as ...
- 128
0
votes
0
answers
47
views
Running OpenFoam command: paraFoam -> Error 420: paraView: not found
I have lately installed OpenFoam v.2212.0 on UBUNTU 22.04.0. All the other OpenFoam commands work fine for me, but as soon as I type "paraFoam", I get the following error:
Invalid $...
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0
answers
39
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grep Not Displaying Results Due To Apparent Garbage Characters In File
I have a file which I have removed all ^M from each line. I can vi the file fine. Here are the first few lines I see in vi after issuing "vi filename":
USE [master]
GO
/****** Object: ...
- 1
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0
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12
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How should this sed command be rewritten to avoid an unterminated 's' command error? [duplicate]
I'm slowly following along with a Linux certification textbook just to bolster my skills a little. Text stream processing is the current topic, and the command I'm working with out of the book uses ...
- 1
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0
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20
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./docker-build.sh: ./mvnw: /bin/sh^M: bad interpreter: No such file or directory [duplicate]
I am using Ubuntu 22.04
File docker-build.sh
#!/usr/bin/env bash
if [ "$1" = "native" ];
then
./mvnw clean -Pnative spring-boot:build-image --projects book-service -DskipTests
...
- 489
0
votes
1
answer
60
views
Loop through file extension Annotate add EXIF Rename and Copy
This script, reads user input from an entry like filename.jpg
it creates a directory inside the current directory. Then renames the file and adds the files EXIF data it then copies the original file ...
- 53
0
votes
1
answer
160
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In Ubuntu is there a way to configure PS1 so that it does not update the window title?
Question
I have a script called title which sets the title bar for a UNIX window, it's simple and just echos an escape sequence. See https://askubuntu.com/a/22417/323009.
#/bin/bash
ESC=$'\e'
BELL='$'...
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0
answers
18
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Loud static voice.Echo cancellation script [closed]
Does anyone know which distro won't give me this problem? I am using Linux Lite latest version,and every time I try to use the echo cancellation which I added by using this script
load-module module-...
0
votes
1
answer
105
views
Tilde not working on Ubuntu I installed on Windows 11
I installed Ubuntu on my Windows 11 and I've been trying to use Tilde on the terminal, but it keeps giving me an error. cd ../Pictures takes me to the Pictures directory, but cd ~/Pictures says:
No ...
-1
votes
1
answer
108
views
Rename and add a number to all folders in a directory
I have a simulation folder on hpc which contains time directories from 0 to 50 with a step of 0.1 (so 501 folders in total with their names as 0, 0.1, 0.2.. and so forth).
Example output of ls:
0 0.1 ...
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-3
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1
answer
58
views
inotifywait does not work for one glob pattern, but works for others
This is my scripts:
#!/bin/bash
. Load
inotifywait -m \
/Base/Qwik/**/*.jsx \
/Project/Web/src/Components/**/*.jsx \
/Project/Web/src/routes/**/*.jsx \
/Project/Web/src/routes/*.jsx \
-r \
-e modify ...
- 673
0
votes
0
answers
37
views
Cant autocomplete "unzip"-command
When I try to use the command "unzip " on any folder I immediately get the line
unzip ls: cannot access 'tmp': No such file or directory
ls: cannot access 'tmp': No such file or directory
^C
...
- 1
0
votes
0
answers
54
views
Su: Failed to execute
I'm new to Linux, and I followed the tutorial on the internet to install zsh then I went into root by typing sudo su then after that I installed zsh in the terminal and after installing I typed chsh -...
0
votes
0
answers
44
views
Script to kill procees in boot not working
Everytime i boot my computer i run:
sudo lsof -i -P -n | grep LISTEN
then look for the PID of 'mysqld' and run 'sudo kill [PID]'
I tried with this script (I also open docker desktop on startup), but ...
- 53
0
votes
0
answers
39
views
How to configure Bash to use lsd for tab-completion?
For the sake of the question, assume I'm on the most-recent (stable) LTS release of Ubuntu.
I've installed a replacement for the ls command. In this case, that replacement is lsd. The same question ...
- 3,093
-1
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0
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37
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Bash alias for a variable name [duplicate]
How do we have Bash alias for variable name e.g.
VAR=99
alias n=VAR
echo $n
# should show 99 but can't
One sincerely help
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0
answers
15
views
after each reboot I need to assign swap manually and /etc/rc.local doesn't get triggered
After every reboot, I'm just seeing one swap in my system.
$ sudo swapon --show
NAME TYPE SIZE USED PRIO
/swapfile file 2G 0B -2
So in /etc/rc.local I've put this piece of instruction:
# ...
- 123
0
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0
answers
45
views
No output of ps and netstat on Ubuntu 22.04 server
It just happened that ps and netstat output nothing.
How can I make it print on console?
Environment:
root@server3-8x64:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
...
0
votes
0
answers
18
views
Screen logs and launching script at boot (/profile.d vs /init.d)
I had a script file (myScript.sh) with the following contents in /etc/profile.d with the to launch at start/reboot. It worked well - no issues.
#/bin/bash
screen -dmS p1 /home/pi/process1/process1d.sh
...
- 139
0
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0
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25
views
Ubuntu directory permissions to share
Assume we have a path /path/to/usera/data, its owner is user_a and Now we want to share this dir to user_b with following steps:
add a group datashare and add user_a user_b to it
sudo groupadd ...
- 111
16
votes
7
answers
4k
views
Can we prevent a command from being executed for root in Linux?
There is this script that is difficult to read and debug.
Somewhere in it, it has commands like this:
sudo chmod -R 777 /$some_var/$another_var
In other words, it creates a path dynamically, and then ...
- 673
1
vote
1
answer
69
views
Create a bash function with parameters to use as an alias
I have realised that my folders follow a specific structure and wanted to access them with cd faster, so I tried to make this alias / function that would behave like this:
cdc glm 03
would be ...
1
vote
2
answers
86
views
Where can I add to the ***universal*** path?
I'm a script kiddie of sorts and enjoy writing bash scripts for things, and I keep them in a repository that I synchronize, and on my personal computers I keep it in a home/otherStuff/customBin folder,...
- 13
0
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0
answers
23
views
Bash sourced files work properly after initial input into terminal
I am messing with my bash setup, and I decided to move it to version control, I made a couple of changes, and moved the .bashrc and .bash_profile to my dotfiles repo. This seems to have caused quite ...
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1
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110
views
What does this command mean: `echo $line | awk -F "\t" '{print $1;}'`?
I'm new to this, and I was wondering specifically what awk -F "\t" means.
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0
answers
21
views
How to set a desktop file in an installation script running as root to "allow launching"
I try to set a desktop file into the "allow launching" state in my installation script running as root. I tried following different ways to get it done:
gio set "/home/ubuntu/...
- 101
1
vote
1
answer
138
views
Two-way pipe in bash?
I have a binary who's stdout is being redirected to the stdin of a python script, and I was wondering if there's any way to send the stdout of the python script to the stdin of the binary, to get an ...
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1
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77
views
Terminal always shows these extra lines after being opened
I am using Kubuntu 22.04.3. Whenever I open the terminal (or konsole), the following five lines are always displayed.
bash: enable: bash: not a shell builtin
bash: enable: completion: not a shell ...
- 829
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29
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bash install without restart popups
Bash script at bottom, on Ubuntu 22.04. It keeps getting popups to restart services on install, you can see I have tried quite a few approaches.
sudo apt update -y
and
sudo apt install -y libgl1
...
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2
votes
0
answers
71
views
How can I update to the latest bash in Ubuntu 22.04.3 LTS?
I am using mcfly (https://github.com/cantino/mcfly). There is a known bug in bash version 5.1 (https://github.com/cantino/mcfly/issues/240, https://lists.gnu.org/archive/html/bug-bash/2022-03/msg00019....
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3
votes
1
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111
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Bash script - new Konsole closing
I'm working on a project that requires me to open some new bash windows to start the docker, server, etc. of the project. I'm trying to make a script so I can start things faster.
So far I have this:
...
- 33
0
votes
1
answer
87
views
Bash script with different CWD from parent shell?
I'm doing a puzzle for my computer science class where I need to execute the binary /challenge/executable via a shell script, from the CWD of /tmp/exampledir, with the shell's CWD being a different ...
- 83
5
votes
1
answer
526
views
Use an array as argv?
In a bash script, I'm calling a function with a large number of arguments, say for example /bin/meaningoflife takes 42 arguments. Is there a way I can pass an array to a command instead of manually ...
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7
votes
4
answers
1k
views
How in Bash to test a name/string is an executable
How, on Bash, do we test a name string is an executable, as tried it won't work:
$ [[ -x cp ]] &&echo YES
$
$ [[ -x ls ]] &&echo YES
as tried it hard won't be correct way:
$ >/dev/...
- 77
4
votes
3
answers
199
views
Bash - variable assignment in a pipeline
I am trying to create a script that monitors for failed login attempts and passes the IP address of those attempts as a variable. But I am having a bit of trouble.
I have the below command which spits ...
- 41
-4
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1
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63
views
Understanding top command output
Below is screenshot of top command output.
I want to understand memory and cpu information in this top's summary view.
I have following doubts:
Are the numbers for us, sy, ni etc in %Cpu(s) in third ...
- 153
1
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1
answer
140
views
Why can't both Windows and Ubuntu recognize a filename with special characters?
I was trying to append to a text file in bash in WSL (using the >> operator). Unfortunately since I'm a beginner instead of appending to a file, a new file was made with the >> 'text' as ...
- 21
-2
votes
1
answer
38
views
how to copy files with some pattern from multiple directories to a single directory?
I have a directory structure
base
|_folder_34231
| |_23491_this_I_want.csv
| |_23491_this_I_dont_want.csv
| |_some_other_things_I_dont_need
| |...
- 425
0
votes
1
answer
54
views
Not at home after login
I have installed Ubuntu 22.04 in WSL2. I expect that the bash shall be started in the home directory that I find in /etc/passwd as
harper:x.1000:1000:,,,,:/home/harper:/bin/bash
But after starting ...
- 103