All Questions
Tagged with bash shell-script
508
questions
0
votes
2
answers
104
views
bash + how to insert date before line
lets say I want to pipe the date output in the beggining of some text
for example
echo "this line is test line" | date
and expected output should be
Wed May 22 14:55:10 UTC 2024 this line ...
- 851
0
votes
1
answer
76
views
Why do string variables in a bash script behave differently when echo'ed than they do when passed to an executable?
I have the following script:
#!/bin/bash
KID3=$(command -v kid3-cli)
ARG1="-c 'get'"
file="'1-01 - Johann Strauss - __Waldmeister___ Ouverture.flac'"
echo Command:
echo "$...
0
votes
0
answers
201
views
how to use curl for single sign-on website or page
I've already written a shell script but it's not working. I'm getting an empty response whereas it should first return a token and also it should login then register the API.
That's the task which my ...
- 1
0
votes
1
answer
34
views
shell helper function wrapping `find` and ignoring some dirs
I have a bunch of scripts which follow the pattern of:
find files which match a pattern
do something
The problem is that there are several "hazard" directories which are large and slow, ...
- 103
1
vote
2
answers
168
views
Why does zip --exclude only exclude files in the folder but not the folder itself?
I have the following command run in the bash shell which excludes the files in the folder scripts/. I tried the answer in Zip command for excluding directories and files but unfortunately it did not ...
- 93
0
votes
1
answer
151
views
How to convert code from test format to if fi format?
I have code that opens a bash file in a terminal for entering the sudo password:
test "$IN_TERM" || {
export IN_TERM=1
konsole -e "$0"
exit 0
} && true
I need ...
- 35
3
votes
0
answers
222
views
Is there a good way to write a shell script compatible with both bash and zsh that addresses array elements?
The fact that bash is 0-indexed and zsh is 1-indexed can cause problems. For example the following will work as intended with bash, but not zsh (PS I am aware that I don't NEED to use an array for ...
- 328
0
votes
1
answer
89
views
How deep is too deep for Nested Folders in a Bash program?
I am somewhat new to Bash and am writing a program to install .NET SDK and Runtime on each of the available Linux distros.
The problem I am having is that I am trying to source functions from two ...
- 101
0
votes
1
answer
73
views
zsh on MacOS catalina 10.15.17
I'm having a little trouble putting this all together...
I want to make a simple shell script to organize and sort around 60 GB worth of music and movie files that are spread out over 3 or for 4 ...
0
votes
1
answer
62
views
Complex find statement
Have a script that I use to purge old backup directories. All the directories are named YYYY-MM-DD. The backup directories have links in them as the backups are incremental using the rsync --link-dest....
- 1
1
vote
1
answer
460
views
Maintain a fixed-size-queue of nohup jobs
Suppose I would like to run multiple nohup jobs but at each time I would like to at most run 4 nohup jobs.
Is there a way to:
keep track of 4 nohup job status
once one of them finishes, it triggers ...
- 13
2
votes
1
answer
140
views
Algorithm to find longest common substring
I'm having a bit of trouble coming up with a general solution to the following problem.
First a bit of context.
End goal: set file permissions on all files and directories created by a rpm
My plan was ...
- 34.5k
0
votes
0
answers
791
views
Reference shell Script within a shell Script in YAML
Is there the right way to reference a shell script written within a script in a YAML file. For eg:
data:
ex1.sh: |
#!/bin/bash -x
. /shellscriptloc/ex2.sh
...
...
0
votes
2
answers
437
views
Bash printf: what does format specifier %P mean?
The printf statement :
find directory1 -type d -printf "%P\n" | sort > file1
in the answer https://superuser.com/a/166322/856910 includes a format specifier %P. From the output of this ...
- 3
0
votes
1
answer
598
views
Running shell Script via Systemd.timer
So I've essentially run into the same problem as in my other question: Running shell Script via Crontab
I will now run my shell script with systemd.timer but it is not working so far.
Here is my ...
2
votes
2
answers
274
views
Why the variable doesn't change even if it should?
I have this bash script:
#!/bin/bash
someVar=0
tac /etc/hosts | while IFS= read line; do
echo "$someVar : $line"
someVar=$((someVar+1))
done
echo "Finally: $someVar"
...
- 157
-1
votes
1
answer
904
views
I would Like to know what -sb and awk '{print $1}' role in this command
subdirectory_size=$(du -sb "$entry" | awk '{print $1}').
I would Like to know what -sb and awk '{print $1}' role in this command.
0
votes
0
answers
96
views
How to automate mybb installation using ssh bash script
I have created this bash script to install mybb application automatically on Centos stream 8.
SSH Bash script
#!/bin/bash
# Define variables for MyBB installation
DB_NAME=mybb_db
DB_USER=mybb_user
...
- 159
1
vote
1
answer
297
views
Can't input text in Bash function called with key binding
I have added a simple function to my .bashrc file and bound it to a key combination using the bind command. The function prompts the user for input using read, like this:
myscript() {
read -p &...
- 13
0
votes
1
answer
136
views
Script to add a tag at the end of files in a folder in case that tag is missing
I'm struggling with a shell script. I have a bunch of xml files, more than 500, and some of them has no end tag </deliveries> I created a shell script that works but only if I write the filename ...
- 1
1
vote
1
answer
398
views
How to find the "pattern" in FASTA file and record the cordinates along with header
I am looking for a solution to search for a string of 17 base pairs in the FASTA file that is the human reference genome.
To clarify, in simple words and put the resources, i have tried grep function ...
- 13
1
vote
0
answers
54
views
$RANDOM, not so random [duplicate]
I want to print out a random number and encrypt it, like so: echo $RANDOM | sha256sum.
I would expect this to take the standard output of echo $RANDOM and pipe it into the encryption function. However ...
- 25
0
votes
1
answer
3k
views
Systemd service exits with "success" but does not perform the .sh script at ExecStart
I'm trying to use a systemd service on a Raspberry Pi (running Raspberry Pi OS version
"Bullseye", a flavor of Debian) to run a bash script on login and it seems to succeed but the script ...
- 327
0
votes
1
answer
37
views
if else condition not matched then move script ahed
I am creating a bash script.. Where I want to check in a file if its out is 1 or 0. If the output is one we need to execute a command if not then the script should move ahed. The part of script will ...
- 143
0
votes
1
answer
297
views
Execute a bash function inside a detached screen
I want to execute single function from the whole script into a detached screen session rather than to run the whole script inside screen. Can someone tell anyway how can I do it?
Like for example
#!/...
- 143
0
votes
1
answer
62
views
Getting error while setting the argument
I'm getting an error while setting the variable in argument.
while [ $# -gt 0 ] ; do
case $1 in
'--pub') fun2exec="loadpubserveripip" ;;
'--tourney') fun2exec="...
- 143
0
votes
2
answers
97
views
How to set variable by just mentioning the number on command line
I want to make a script where I can mention the matchid in argument and then it selects to value of variable like below
1=IND vs PAK
2=SA vs SL
3=AUS vs ENG
So like when I run the script as
./match....
- 143
0
votes
2
answers
170
views
Call a function from command line and pass variables into that fuction
I am new to bash scripting. I want to create a script where I can execute a specific function from it with its variables.
Like for example
#!/bin/bash
fun1(){
echo "Hello $name"
}
fun2(){
...
- 143
1
vote
1
answer
2k
views
Read from stdin while piping to next command?
How can you prompt a user for input, when the output is being piped?
> (echo -n 'input data: '; read TEST; export TEST) | echo "done: ${TEST}"
This does not show the "input data&...
- 1,518
0
votes
1
answer
243
views
Unable to move cursor to next line after reading secret input in shell script
I am trying to read multiple inputs from user in shell script,
#!/bin/bash
read -sp "Enter the secret api key: " var1
read -p "Enter the mount path:" var2
If I try to run this, I ...
0
votes
1
answer
2k
views
How can I pack multiple bash scripts into one single executable
I have multiple bash scripts and resources required by these scripts (like music files and images) and I want to pack them all into one executable file.
For example:
$ find Scripts/
Scripts/
Scripts/...
2
votes
1
answer
1k
views
Execute EOF command remotely in one line
I am facing a problem. If I execute this command, it works normally, but I need to execute it using SSH connection. Is there a way to do it in just one line of command? Thank you for your attention.
...
2
votes
3
answers
2k
views
Delete all folders except if they have a specific file type in Linux
I looking for a command or bash script to delete all folders except if they have a specific file type (*.pdf) in the first level subfolder.
folder01
a.txt
y.txt
folder02
b.pdf
z.txt
folder03
...
- 123
0
votes
1
answer
184
views
shell script getopts options validations
I'm trying to check if all the validations are true and work but my logic I think is not correct and I'm new to coding. So I initialized p=0 and un=0, when user passes both option it should give error....
- 1
0
votes
0
answers
35
views
Bash: simplify variable replacement/upper-casing?
Is there any way to cleanly simplify this into a single line?
# e.g. ARG='--some-arg'
ARG=${ARG/--/} # some-arg
ARG=${ARG//-/_} # some_arg
ARG=${ARG^^} # SOME_ARG
I'm hoping for a syntax ...
- 1,518
2
votes
0
answers
190
views
Does tput automatically check color abilities when loading color codes?
When using tput setaf and tput sgr0, does it automatically output nothing if the session isn't tty-like or no color support is detected?
So am I fine doing this?
declare -r styleRed=$(tput setaf 1)
...
- 21
0
votes
1
answer
429
views
put list of IP addresses into config file as text
I have config file for fail2ban where I try to put multiple IP addresses automaticly with script. But I am probably doing some mistake as the script is spamming ignoreip = ip in a loop till the fille ...
- 113
1
vote
0
answers
204
views
Execute a command after matching a specific rule of iptables
Is it possible or is there any way from which a bash script can be executed using iptables?
Like I wanted to execute a bash script if incoming traffic on a udp port crosses 1000pps
I tried searching ...
- 143
4
votes
1
answer
3k
views
How to always execute a command when a shell script function finishes?
I need to write a zsh function with multiple exit points and execute the same clean-up command at every one of them:
function foo {
if ... ; then
...
run_cleanup
return
...
- 3,173
0
votes
0
answers
495
views
How to log Linux commands ran from a script?
I am able to log commands executed on bash shell using export PROMPT_COMMAND='history -a > ..... , but this wont log commands executed from within a shell script.
Is there any way to log command ...
0
votes
1
answer
60
views
Refining a simple delete-item one-liner
so I was wanting to upgrade my delete-item one-liner. I want to breakup the main filepath(\HQDEVAPP004\C$\LoneStar\ProcessorHandlers\Test) into 2 variables that are defined at the top of the script. ...
- 83
1
vote
1
answer
472
views
How can I get my Lubuntu system to "beep" via bash script?
Running Lubuntu 20.04LTS, and trying to get a nice beep when a bash script finishes.
Before anyone votes this down, I have tried:
beep
and
sudo modprobe snd-pcsp
and
say
and
echo -en "\007&...
- 171
4
votes
2
answers
24k
views
mv: target 'XXX' is not a directory
I am trying to write a bash script that will go through a directory
and rename the files (the file name is really crazy and is not recognizable to any human as what they are) to "Chapter1.mp3&...
- 414
0
votes
1
answer
328
views
[SHELL SCRIPTING SMALL PROJECT]
I am currently trying to complete this shell script for a small project I have for my class. I'm lost as to how to go about this problem. Here is the prompt and what I have so far...
What I have so ...
-2
votes
1
answer
1k
views
List/Print oldest and newest file in each directory
Could use a bit of help guys.
I need to produce a report for the oldest and newest files that are residing in each unix directory
The structure is simple
Main folder with multiple subfolders that ...
- 3
1
vote
1
answer
2k
views
Understanding how pgrep determines process IDs
I'm currently refactoring a script that works well if executed in terminal directly but exits early due to a process check if executed from crontab. This early termination is caused by code using a ps ...
- 13
1
vote
1
answer
2k
views
How to download the latest release from github and extract the zip in a folder using bash
I want to write a bash script to download the latest release from a github repo and extract the downloaded zip into a particular directory.
From this gist I am able to download the zip file. The shell ...
- 13
1
vote
1
answer
112
views
Cancel background script run from any shell
I have a script I usually keep running in the background; it sets up port forwarding I use for database connections while developing an app whose details are irrelevant at the moment. Because I always ...
- 13
0
votes
0
answers
78
views
Variables inside commands inside if statement
I do not understand why this does not work:
existing_user=$(ldapsearch -x -b "cn=group,ou=group2,dc=company,dc=com" -H ldap://127.0.0.1 -D "cn=admin,dc=company,dc=com" -w "...
1
vote
2
answers
72
views
Creating multiple symlinks from a string
I have the following script:
#!/bin/bash
test="../t1,../t2,../t3"
ln -sf "{${test}}" .
Above this directory consists of 3 directories:
../
├── script
│ └── test.sh
├── t1
├── ...
- 13