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This should work
if grep -q pattern file_name
then
fi

or
if grep pattern file_name >/dev/null 2>&1
then
fi

If you look at the permissions of the passwd command (I'll just list the one on my system):
ls -l $(which passwd)
-rwsr-xr-x 1 root root 37140 2010-01-26 18:09 /usr/bin/passwd

you'll notice...

Because gzip saves, into the file, the modification time of the file, as well as the original file name if possible:$ echo "TestTestTest" > test1.txt
$ stat test1.txt
File: `test1.txt'
Size:...