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52 questions linked to/from How can I assign the output of a command to a shell variable?
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355 votes
5 answers
1.4m views

I want to have a script that takes the current working directory to a variable. The section that needs the directory is like this dir = pwd. It just prints pwd how do I get the current working ...
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31 votes
4 answers
144k views

I have an operation using cut that I would like to assign result to a variable var4=echo ztemp.xml |cut -f1 -d '.' I get the error: ztemp.xml is not a command The value of var4 never gets assigned; ...
Vass's user avatar
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12 votes
5 answers
7k views

I am writing a script which loops into recent files in a folder and executes a command... #!/bin/bash cd /home/Downloads recent_files = ($(ls -t | head -20)) for file in "${recent_files[@]}" do ....
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0 votes
2 answers
30k views

I am connecting to mySQL database using a shell script. After connecting to the mySQL database, I execute a query. The query gives me 300,000 URLs as the result. For each of the 300,000 URLs I need ...
Ramesh's user avatar
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1 vote
1 answer
16k views

Given a filepath, I would like to find out how many lines there are and store them into a variable. For example: /three_little_pigs.csv straw wood bricks In a file, I would like to have the number (...
bryan.blackbee's user avatar
  • 113
1 vote
1 answer
28k views

I executed a command in a shell script and the command ends with "completed successfully" or "completed unsuccessfully". How can I read that in the script and use it for if and else conditions?
user1991142's user avatar
  • 11
0 votes
1 answer
10k views

I'm a novice at bash (more like less than a novice). Trying to get the results of this into a variable ssh root@HOST "ls -tr /path/to/files/Backups | tail -1" This is what I have #!/bin/bash STR=ssh ...
Eric's user avatar
  • 103
0 votes
1 answer
10k views

How can I assign value of $x1+$x2 to bc by piping? here in my code $bc holds no value. echo -n 'value x1 : ' read x1 echo -n 'value x2 : ' read x2 echo $x1+$x2 | bc echo $bc
Maruf's user avatar
  • 1
1 vote
2 answers
4k views

My bash script #!/bin/bash read -r -p "Enter the filenames: " -a arr for i in "${arr[@]}" do echo $i | sed 's/\(.*\)\..*/\1/' cp -v ~/Desktop/library/template.py "$i&...
Mega Bang's user avatar
  • 159
1 vote
1 answer
4k views

I am trying to set the variable service to be the value of var1=first/second echo $var1 | cut -d '/' -f 1 var2=$var1 | cut -d '/' -f 1" echo $var2 The result of echo $var1 | cut -d '/' -f 1 is "...
fuzzi's user avatar
  • 13
0 votes
1 answer
5k views

I would like to know how to capture the output of this command into a variable ssh -q $ssh_host 'ps -eo comm,lastcpu' Once the information is captured, I want to check the variable if it returned ...
SaSa2929's user avatar
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0 votes
1 answer
4k views

I'm trying to store the first 5 lines from a file in the variable url. But I get an error -n5: command not found fn_all_urls stores the path to the file /home/urls.txt My Line is: url=head -n5 ${...
Rick T's user avatar
  • 357
0 votes
1 answer
3k views

So I'm trying to make a sh script where I put a value that I get from a command, into a variable, in this case n, but I have no idea what I'm doing, and this here obviously doesn't work lol: 1 n=0 ...
iamAguest's user avatar
  • 553
0 votes
1 answer
2k views

i tried the below code to store the date output in variable. read -p 'date: ' mydate date_month= date -d "$mydate" +%b echo $date_month it is not printing the output. how to store the date output in ...
vijai raghunath's user avatar
  • 1
1 vote
1 answer
2k views

I know how to set a BASH variable equal to the output from a command, but it doesn't work in case of 'top' command for me, see below cat aTOPFWK.sh OUTPUT = $(top -b -n 1 | egrep 'fwk3' | awk '{...
irom's user avatar
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