/Shell/Bash/Linux test if string exists in file

Linux test if string exists in file

if grep -Fxq "string" file.txt; then 
	echo "Match"
else 
	echo "No match"
fi

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

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