/Shell/Bash/Bash check if string does not exist in file

Bash check if string does not exist in file

Just use grep with flags 'F' (fixed string), 'x' (exact match) and 'q'
(quiet output) in order to check if a word string is in a file
if ! grep -Fxq "string" file.txt; then #do some code...#; fi

Similar codes

0 vote349 views2 answers
Ansible run tags
Shell/Bash
0 vote389 views1 answer
Grep all lines after first match
Shell/Bash
0 vote339 views1 answer
Linux get ip by domain
Shell/Bash
27 votes364 views6 answers
Install pandas
Shell/Bash
4 votes339 views3 answers
There is no tracking information for the current branch
Shell/Bash
0 vote357 views2 answers
Ubuntu install arial font
Shell/Bash
1 vote330 views1 answer
Intall prettier vscode
Shell/Bash
1 vote344 views1 answer
Alamofire pod install
Shell/Bash
0 vote325 views1 answer
Uninstall R
Shell/Bash
1 vote334 views1 answer
Gnu octave ubuntu 20.04
Shell/Bash