display contents of a file w/o any comments or blank lines

egrep '^[^#]' some_file

4
By: nottings
2009-02-19 17:35:52

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    sed -e '/^[[:blank:]]*#/d; s/[[:blank:]][[:blank:]]*#.*//' -e '/^$/d' -e '/^\/\/.*/d' -e '/^\/\*/d;/^ \* /d;/^ \*\//d' /a/file/with/comments
    unixmonkey6951 · 2009-11-10 17:47:22 2
  • Shows a file without comments (at least those starting by #) - removes empty lines - removes lines starting by # or "some spaces/tabs then #'" Useful when you want to quickly see what you have to customize on a freshly installed application without reading the comments that sometimes are a full 1000 lines documentation :) While posting, I saw this http://www.commandlinefu.com/commands/view/1041/display-contents-of-a-file-wo-any-comments-or-blank-lines But it's dirty and incomplete, to my mind My original goal was to remove lines like "\t*#" but I can't figure out how to do a egrep '\t' on a command-line. Two workarounds if needed: egrep -v 'press control + V then TAB then #' /your/file or egrep -v -f some_file /your/file #where some_file contains what you want to exclude, example a really inserted TAB


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    egrep -v "^$|^[[:space:]]*#" /etc/some/file
    michauko · 2009-05-12 07:14:48 4
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    Highwayman · 2009-04-07 11:32:06 4
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    1
    alias noc="awk 'NF && ! /^[[:space:]]*#/'"
    pooderbill · 2014-09-07 00:50:57 0

What Others Think

grep -v "^#" some_file It's easier
n0ky75 · 483 weeks and 1 day ago
or even grep -v \# some_file
wwest4 · 483 weeks and 1 day ago
er... grep ^\# some_file
wwest4 · 483 weeks and 1 day ago
fok! grep -v ^\# some_file jeez.
wwest4 · 483 weeks and 1 day ago
awk '!/#/' file
sil · 483 weeks and 1 day ago
For the fun! sed -n '/^#/!p' some_file
n0ky75 · 483 weeks and 1 day ago
none of these deal w/ leading whitespace anyway. better: awk '!/(\b)?\#/' ...dealing with trailing comments is not really practical, i guess.
wwest4 · 483 weeks and 1 day ago
grrrr... I forgot an important piece in the description... my command doesn't display empty lines either. Whereas, things like grep -v "^#" do
nottings · 483 weeks and 1 day ago
@wwest4 seems you're struggling pretty hard. Maybe try testing your command in the shell before committing the comment? Further, what you ended up with doesn't certainly isn't as beautiful as the initial command. Further, '^[^#]' can be used in vim, less, sed, awk, and many programs making it beautiful.
atoponce · 478 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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