I have a shell script where I need to do one command if a file is zipped (ends in .gz) and another if it is not. I'm not really sure how to approach this, here's an outline of what I'm looking for:
file=/path/name* if [ CHECK FOR .gz ] then echo "this file is zipped" else echo "this file is not zipped" fi 3 Answers
You can do this with a simple regex, using the =~ operator inside a [[...]] test:
if [[ $file =~ \.gz$ ]]; This won't give you the right answer if the extension is .tgz, if you care about that. But it's easy to fix:
if [[ $file =~ \.t?gz$ ]]; The absence of quotes around the regex is necessary and important. You could quote $file but there is no point.
It would probably be better to use the file utility:
$ file --mime-type something.gz something.gz: application/x-gzip Something like:
if file --mime-type "$file" | grep -q gzip$; then echo "$file is gzipped" else echo "$file is not gzipped" fi Really, the clearest and often easiest way to match patterns like this in a shell script is with case
case "$f" in *.gz | *.tgz ) # it's gzipped ;; *) # it's not ;; esac You can try something like this:-
if [[ ${file: -3} == ".gz" ]] 
