explainshell.com - grep -q %27%5Eoption%27 file %26%26 sed -i %27s%2F%5Eoption.%2A%2Foption%3Dvalue%2F%27 file %7C%7C echo %27option%3Dvalue%27 %3E%3E file

-q %27%5Eoption%27 file %26%26 sed -i %27s%2F%5Eoption.%2A%2Foption%3Dvalue%2F%27 file %7C%7C echo %27option%3Dvalue%27 %3E%3E file

print lines matching a pattern

-q, --quiet, --silent
       Quiet; do not write anything to standard output.  Exit immediately with zero status if  any  match
       is  found,  even  if  an  error  was  detected.   Also see the -s or --no-messages option.  (-q is
       specified by POSIX.)

grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus
(-) is given as file name) for lines containing a match to the given PATTERN.  By  default,  grep  prints
the matching lines.

-i, --ignore-case
       Ignore case distinctions in both the PATTERN and the input files.  (-i is specified by POSIX.)