I have the same need as http://stackoverflow.com/questions/14631794/check-if-file-contains-some-text-not-regex-in-unix#comment20438757_14631832.
$ cat file foo bar $ echo "$fixed_string" bar foo $ grep -Fzq "$fixed_string" file && echo "Matched" || echo "Not matched" Matched # false positive, -z doesn't apply to -F $ [[ "$(cat file)" = *"$fixed_string"* ]] && echo "Matched" || echo "not matched" not matched # my workaround
