27 июл. 2021 г. · I'm trying to write a small bash script that will check if each element of a sequence of numbers is in a given file, and print the ones that aren't.

3 мая 2011 г. · I am trying to get the number of occurrences in a script and when running the command on the command line, it works fine, but not in a script.

16 нояб. 2017 г. · I have a basic script for finding specific installed packages in Linux. If not found -> print the package. I used grep -w , but it didn't work ...

7 мая 2014 г. · All you need is: if prlctl list --info ubuntu-vm | grep -q "State: running"; then echo 'machine is running' else echo 'machine is not running' fi

17 февр. 2017 г. · The first is to use grep -c instead of -q, so it outputs the number of matches found, and you can capture that with $() and compare to 0.

20 янв. 2017 г. · To test and handle both the true and false the conditions on one line you can do this: [ -f "/usr/bin/wine" ] && export WINEARCH=win32 || echo "No file"

17 янв. 2013 г. · I am trying to build a grep search that searches for a term but exludes lines which have a second term. I wanted to use multiple -e "pattern" options but that ...

21 окт. 2018 г. · You need echo "$output" | grep -q "Correct" if all you have is a string variable without a corresponding file.

8 июн. 2018 г. · If you just wanted a plain text search without caring about columns, you can chain the inverted match grep -v like so: cat input.txt | grep ...

12 нояб. 2015 г. · If the pattern isn't found in the file, grep returns false (i.e. exits with a non-zero exit code), so the echo is executed. The -e says to ...