Somtimes you only want to see configuration in a config-file, to filter out every blank line and every comment line a simple:
egrep -v '^$|^#' something.conf | | | | '-> a mesh at the beginning of line | | | '-> or | | '-> from start to end ... nothing -> blank line | '-> do not show ... containing '-> to match against regular expressions
will do the work.
Found another way:
Also filters comments and blank lines (but no spaces and tabs).