Bash, если файл содержит строку
if grep -q SomeString "$File"; then
Some Actions # SomeString was found
fi
Witty Wolf
if grep -q SomeString "$File"; then
Some Actions # SomeString was found
fiJust 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