Grep only uncommented lines
In our daily work as sysadmins we sometimes bump into very large config files when we are only interested in a line or two. In this scenario our old good friend grep comes in handy.
Get rid of all lines containing #
We use the -v parameter to invert the search
grep -v '#' config_file
Get rid of all lines starting with #
We use ^ to indicate start of line
grep -v '^#' config_file