Questions tagged [shell-script]

Questions about shell scripts, executable files that are interpreted by a shell (bash, zsh, etc.).

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kill -s SIGINT does not work as expected when launched from init.d script

I want to start some python script (with venv) at startup and monitor the status, for auto restart it if something goes wrong. I've made: - a simple python example prg.py that sleep forever and exit ...
Katte's user avatar
  • 101
9 votes
4 answers
8k views

Bash Read: Reading comma separated list, last element is missed

The output of the command below is weird to me. Why does it not give me back element 5? $ echo '0,1,2,3,4,5' | while read -d, i; do echo $i; done 0 1 2 3 4 I would expect '5' to be returned as well. ...
Karel's user avatar
  • 1,468
2 votes
1 answer
534 views

How to modify this `while read; mv printf` code to rename only files of certain filetype?

Code in question: ls | cat -n | while read n f; do mv "$f" `printf "video_%03d.mp4" $n`; done The above code will rename all files/folders within the directory executed to: video_001.mp4 video_002....
Anonymous's user avatar
  • 503
0 votes
1 answer
94 views

Restore function in unix

I have a script to recover files back to their original location. I am missing the options for the script to as "Do you want to recover this file?" Yes or No. How will I implement it into this code ...
user3531567's user avatar
5 votes
1 answer
485 views

How to pipe multiple results into a command?

I have a piece of code which works, something like this (note this is inside CloudFormation Template for AWS auto deployment): EFS_SERVER_IPS_ARRAY=( $(aws efs describe-mount-targets --file-system-id ...
Carmageddon's user avatar
1 vote
0 answers
240 views

How to enable Python automatically after restarting my Centos 6.5 machine?

I am using Software Collections Repository (SCL) to install Python 3 package "rh-python36" on Centos 6 machine. I am adding this script to .sh file located in the /etc/profile.d directory: #!/bin/...
Aminovic's user avatar
  • 187
1 vote
1 answer
205 views

How to move lines containing specific text to top of file in same order as code executed?

How to move lines containing specific text to top of file in same order as code executed? Here is the code I have: printf 'g?_001\|_002\|_003\|_004\|_005?m0\nwq\n' | ed -s target_file ( credit ...
Anonymous's user avatar
  • 503
0 votes
1 answer
4k views

Jenkins how to catch error in script

What I am trying to do is once source .... command is executed if there is an error I want to put it into temp file. I tried several ways but no luck. def responseValue = sh(script: """#!/bin/...
user2281130's user avatar
1 vote
3 answers
1k views

How to move lines containing specific strings to top of file?

How can I move lines containing specific strings (ie. 005, and 007) to the top of the target file? Contents of target file: XXX_008 XXX_001 XXX_002 XXX_009 XXX_003 XXX_006 XXX_005 ----> located ...
Anonymous's user avatar
  • 503
0 votes
1 answer
51 views

Find files and specify some to come first in playlist, and the rest in random order?

The following code creates a list of the files in the directory and then shuffles them in a random order then spits out the file in a text document called list.txt find *.EXT | sed 's:\ :\\\ :g' | ...
Anonymous's user avatar
  • 503
1 vote
1 answer
448 views

wget -i notifying when each file finishes (for processing purposes)

I'd like to be able to process multiple files downloaded by wget -i immediately after they are downloaded (instead of waiting for all files in the list to finish--for the entire wget process to exit). ...
Bailey Parker's user avatar
0 votes
1 answer
266 views

How can we alert when EFS is unmounted for Linux EC2 servers?

I am using below script in cron job to get alert whenever EFS got unmounted. But its not alerting me when the EFS is unmounted. #!/bin/bash Hostname=$(hostname) ##email subject subject="EFS is ...
Santosh Garole's user avatar
1 vote
3 answers
84 views

read file and based on criterion print desire output

I have input file which looks like this: H1 O1 C1 H2 H3 O2 C2 Br1 I want to have an output file which to have the following output H1 = 1 O1 = 8 C1 = 6 H2 = 1 H3 = 1 O2 = 8 C2 = 6 Br1 = 35 So when ...
Dimitris Mintis's user avatar
1 vote
2 answers
183 views

Listen to a folder and modify incoming files on change

I want to convert pcap files to json files using shell script (and tshark). As soon as one or more new pcap files are copied into a folder, the command tshark should be executed and the resulting json ...
mudvayne's user avatar
1 vote
0 answers
59 views

Is there a way to detect a sound above a certain volume playing through a device and react to it with a command?

I'm doing some scripting for automating a game and I need to click the mouse button and run some bash code every time a loud sound is played in the game. Is this possible with bash? (Pop OS 19.04)
user353032's user avatar
4 votes
1 answer
9k views

Copying contents of a folder via SCP results in `scp: error: unexpected filename: .`

I was using a script to copy the contents of a folder via SCP, without copying the folder itself. Something like this: scp -i id_rsa -P "$PORT" -r "$HOST:/folder1/folder2/." "backup" (I'm not able ...
finefoot's user avatar
  • 3,020
0 votes
2 answers
189 views

Concatenate the Content of Files from Various Directories with a Blank Line in Between

I have the file dir1.txt that contains the names of the following directories: 2 3 4 Directory 2 contains files 2_1.txt and 2_2.txt Directory 3 contains files 3_1.txt and 3_2.txt Directory 4 ...
soti84's user avatar
  • 5
2 votes
0 answers
71 views

bash script to output 15 lines or more of logs to a file if they occur in a 15 minute time frame

I am looking to create a script that will run daily via a cron job that: output 15 lines or more of logs to a file if they occur in a 15 minute time frame and contain the keyword 'disconnects' email ...
csygtec's user avatar
  • 21
1 vote
1 answer
1k views

cp runs from command line but file not found from script [duplicate]

I have a script to reorganize my directory structure that contains: files=./*"$pattern"I{"$ifirst".."$ilast"}.ext cp ${files} ../"$pattern"/"$i"/ When I run the script, I get an error: ./*S6I{001.....
Chris 's user avatar
  • 11
0 votes
1 answer
217 views

How to start my application after starting of "daemon" process in single script

I have a script, that starts my server. I want to start openvpn client before it. Here my current working solution: #!/bin/sh openvpn --client --config $OVPN_CONFIG & sleep 10 npm start I ...
zella's user avatar
  • 101
1 vote
1 answer
746 views

How do I confirm a file sync has completed before executing a command?

I have a computer periodically syncing folders of content with another computer using Resilio Sync. The receiving computer has a sorting process on an hourly cron, which analyses the folders and their ...
Kusuma Nassim's user avatar
0 votes
2 answers
98 views

How to remove repetition of the content of file by column?

I have a file containing the following content: WP_021815421.1 OG5_132922 deth|YP_182312 3 -07 42.35 81.7 WP_021815427.1 OG5_128110 rbal|NP_868155 1 -55 50.72 53.2 WP_012456834.1 ...
Mendel's user avatar
  • 3
1 vote
1 answer
1k views

Writing a Shell script to tail and gzip a log file

I'm trying to make a script that can tail log files from a remote server to my local directory. tail -F is what I'm using but after piping it with gzip, nothing happens although a local copy of the ...
Momonga's user avatar
  • 13
2 votes
1 answer
2k views

POSIX and Portability | shell scripts | grep -s, grep -q

I am all in for portability in regards to shell scripts. But I am unsure if I am overdoing it right now. In this example, we have a function called confirmation, which accepts the very first ...
Vlastimil Burián's user avatar
1 vote
1 answer
611 views

Shell script to test ls output for directories

I am trying to make a BASH script to test the files in the working directory and return the files that are directory files. One approach that I can think of is, starting with ls and feeding the ...
Antonio Rodriguez's user avatar
2 votes
2 answers
728 views

How to insert a name of the file as a header of a file?

Example: File name: ENSG00000000003 ENSG00000000003 43120.829491094 ENSG00000000005 39604.4956791524 ENSG00000000419 7645.05624570546 ENSG00000000457 2157.49855156382 ENSG00000000460 3317.98417717746 ...
Priya's user avatar
  • 167
2 votes
0 answers
1k views

PAM configuration to execute a shell script on every login failure

I would like to execute my shell script on every login failure. To do this I updated the file /etc/pam.d/common-auth: From (original body): auth required pam_env.so auth required ...
user352765's user avatar
2 votes
4 answers
8k views

Grep value of a specific key from a String, concatenated of key : value pairs

I have a string which is concatenation of "key":"value" pairs separated by "," like- KEY1:VALUE1, KEY2:VALUE2, KEY3:VALUE3 From this string, I have to grep for a specific string -- let's say KEY2 -- ...
Abhijeet srivastava's user avatar
0 votes
1 answer
683 views

how to run a bash that must be run with a specific user with another user without password

I have 2 users. test1 that i created it with /sbin/nologin and has no password. test2 that has sudo privilege and has passworsd. I have this script: /data/tempWork/fazitst that must be run under ...
BlackCrystal's user avatar
0 votes
1 answer
765 views

How to make a full bash script that compares the shadow and the passwd file?

I have two files, passwd and shadow a. Sort both files b. Compare both files line by line   i. Match on user name output to third file   ii. If it doesn’t match, output to fourth file   iii. ...
Murad Zaman's user avatar
1 vote
1 answer
67 views

How can i use my find in an if else statement to find duplicate files?

I want find duplicate files using my find, i cant seem to to make it echo "bububu" since it keeps echoing "blablabla" even if my path and name are wrong and there is no such file in that directory. Im ...
Sama's user avatar
  • 11
2 votes
1 answer
443 views

Create persistent array in bash

I want an associative array in my bashrc file and I want to add to or delete from it whenever needed, but if I put the array declaration in the bashrc file it will get redeclared every time bash is ...
aderchox's user avatar
  • 691
-3 votes
1 answer
340 views

Script to prompt for the number of users; check how many files they have in their home directory and send a list of those users to the standard output [closed]

My homework asked me to The users are storing way too many files in their home directory and you would like to notify the top 5 offenders. You might want to run this script again for more or ...
nick's user avatar
  • 1
4 votes
1 answer
3k views

Run script for 10 times or until it meets the condition

I have following shell script. OUTPUT=$(systemctl is-active etcd) if [[ $OUTPUT == active ]]; then echo "The result is successfull" else echo "The result is unsuccessfull" fi I ...
smc's user avatar
  • 591
0 votes
1 answer
1k views

How can I pass an argument in a shell script without quotes?

I have to make my own command shell where a bash script calls the shell executable and does so with quotes. The problem is that when I try to do so with logical operators it seems that the quotes turn ...
Code4life's user avatar
0 votes
1 answer
1k views

How to compare user input with content in text file?

I am making a script that allows users to save their settings in a text file. If they want to use the saved settings, they will need to input the name of the settings. Then the script will compare the ...
user352457's user avatar
-1 votes
1 answer
645 views

Does execvp() account for logical operators?

In my class assignment I'm supposed to make my own command shell. In the shell, I am supposed to have it take various command line arguments including logical operators such as && and ||. I ...
Code4life's user avatar
-1 votes
1 answer
81 views

How can I run only a portion of a command line in a user built shell?

I make a shell that takes arguments in a command line with special conditions on what it is able to do. For example, anything that appears after the # character will be considered as a comment and ...
Code4life's user avatar
0 votes
1 answer
155 views

Fork urxvt in bash without hitting Control-c

I know I can create new sub-shells (please correct me on terminology) in bash by using &. However this requires me to hit Control-c to get back to bash with most programs. Is there a way to stop ...
myc3lium's user avatar
1 vote
2 answers
586 views

Bash recursive call fails

I am writing a function in ./bashrc to switch environment variables, commands, etc. This function is supposed to set up the necessary variables then call itself. Instead I get bash: ./bash: No such ...
NastyDiaper's user avatar
0 votes
2 answers
2k views

Bash needs to send a command to another CLI

I want to automate some command the thing is we login to the server and the next commandline isn't a linux commandline but rather that of an application it self. My current attempt of solution is the ...
Joeri_Damian's user avatar
3 votes
2 answers
2k views

PIPESTATUS from commands in $(...|...)

How to read ${PIPESTATUS[0] of a command, when a variable is set in current shell? Is there a way to pass it to current shell somehow? I am setting variable MAIL=$(ldapsearch.... | find_for_mail) and ...
Chris's user avatar
  • 4,041
2 votes
1 answer
2k views

Pass script to background using script itself

It is possible to do something like this: nohup ./run.sh > /dev/null 2>&1 & Which sends the process to background, discards its output and allows us to close terminal. Is there any ...
user avatar
0 votes
1 answer
3k views

Install dependencies for a bash script

I've recently made a bash script that can be downloaded and installed by users via a Makefile. The problem is that I'm not sure how to have dependencies get installed. In this case, the only ...
APixel Visuals's user avatar
-1 votes
1 answer
32 views

Value addition from a file's row [duplicate]

Suppose I have one file like: apple | red | 2 apple | green | 3 orange | yellow | 3 apple | yellow | 1 Now I need following output as (irrespective of color value should get third number ...
rawal's user avatar
  • 1
1 vote
2 answers
365 views

Non-Root User SSH Privileged Command with File Piping

I have an a SSH server where root login is disabled. I'm hoping to run a privileged command that will want input from a file I have after being executed. I'm hoping to do all without user interaction ...
notsoslimshady's user avatar
1 vote
1 answer
603 views

bash next month error

Running into errors. I am trying to get the next month when a user sends a date in. D="2019/12/01"; D=$(date -d "$D"); echo "Current Date = $D"; prints Current Date = Sun Dec 1 00:00:00 EST 2019 ...
user3525290's user avatar
0 votes
1 answer
229 views

For loop if statement syntax error

I have syntax error in my code to move files if the statement is true.The code goes on forever.Also tried adding quotes but unable to.I know there would be some silly mistake that I am doing. for ...
Ron's user avatar
  • 1,057
0 votes
3 answers
270 views

How to add a modular bash script to `bin`?

I have a bash script that uses source to make the script more modular. Here's how it would look copied into a user's bin directory: /bin modules/ script-1 script-2 script-...
APixel Visuals's user avatar
0 votes
3 answers
339 views

Add data to a particular line in a file

I need to build a script that adds comma separated values into a particular line in a file. Say I have a file with contents: DL1 : [email protected],[email protected],[email protected] DL2 : [email protected],[email protected],tuy@kk....
Krishna Vuda's user avatar

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