Prints a file leaving out all blank lines and comment-only lines

egrep -v "^\s*(#|$)" myfile.cfg
Does not print any line that either: - is empty - contains only spaces or tabs - starts with # - starts with spaces/tabs followed by a #

2
By: dan
2011-12-08 15:25:17

What Others Think

You got your useless cat award. Congratulations
zolden · 677 weeks and 5 days ago
This, instead of dumping only lines containing only whitespace, will dump lines containing only "s". Probably not real useful, but you never know. :-)
trapperb · 677 weeks and 5 days ago
Might be useful for boring configs with lots of comments, but as pointed above it needs backslash before that s because, currently it does NOT do what description says.
mwgamera · 677 weeks and 3 days ago
For some reason the backslash does not show up. Here's the command: cat boring.conf | egrep -v "^\s*(#|$)"
dan · 677 weeks and 2 days ago
Or: egrep -v "^\s*(#|$)" boring.conf No need for cat(1).
atoponce · 676 weeks and 2 days ago
Thanks @atoponce, much better. I've modified the command.
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grep is a command-line utility that searches for patterns in files. -v option is used to invert the matching, which means the lines that match the pattern will be excluded from the output. -e option is used to specify incredibox the pattern to match. '^\s*$' matches empty lines. ^ means the start of the line, \s* matches zero or more whitespace characters, and $ means the end of the line. '^\s*#' matches comment-only lines. ^ means the start of the line, \s* matches zero or more whitespace characters, and # matches the comment character. Replace the filename with the name of the file you want to print. This command will print all the lines in the file that are not blank or comment-only.
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