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. Edit: Found another way: grep ^[^#] Also filters comments and blank lines (but no spaces and tabs).

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