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UNIX for Dummies Questions & Answers
SED and it used with | and grep
Post 47133 by oombera on Tuesday 3rd of February 2004 01:26:03 PM
02-03-2004
yawwwwn
Oh well, I think you really should read more books, but I was bored and stepped through that line piece by piece, so...
1) sed 's/[^a-z(_]/ /g'
Replace anything that's not a small letter, left parenthesis or underscore with a blank space
2) tr ' ' '\012'
Replaces every blank space with a return character
3) grep '[a-z]'
Only display the lines containing a small letter in them
4) sed 's/^[(]*/ /'
Inserts a blank space at the beginning of every line, erasing the left parenthesis from the beginning of any lines that might have one
5) grep '($'
Display only lines that end with a left parenthesis
6) sort -u
Sort the result of the last command and if one entry is displayed multiple times
7) tr -d "("
Remove the left parenthesis from the end of the lines that were just sorted
------------------------
If all you're trying to do is display the name of the functions, then you can do something like:
grep '^_.*(.*)' CPROGRAMS.c | awk -F"(" '{print $1}' | sort -u
There's probably an even shorter way, but this is an improvement.
1) sed 's/[^a-z(_]/ /g'
Replace anything that's not a small letter, left parenthesis or underscore with a blank space
2) tr ' ' '\012'
Replaces every blank space with a return character
3) grep '[a-z]'
Only display the lines containing a small letter in them
4) sed 's/^[(]*/ /'
Inserts a blank space at the beginning of every line, erasing the left parenthesis from the beginning of any lines that might have one
5) grep '($'
Display only lines that end with a left parenthesis
6) sort -u
Sort the result of the last command and if one entry is displayed multiple times
7) tr -d "("
Remove the left parenthesis from the end of the lines that were just sorted
------------------------
If all you're trying to do is display the name of the functions, then you can do something like:
grep '^_.*(.*)' CPROGRAMS.c | awk -F"(" '{print $1}' | sort -u
There's probably an even shorter way, but this is an improvement.
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LEARN ABOUT DEBIAN
gchem3d
GCHEM3D(1) gnome-chemistry-utils GCHEM3D(1) NAME
gchem3d - a small chemical viewer application SYNOPSIS
gchem3d [OPTION(S)...] [FILE...] DESCRIPTION
gchem3d is a small chemical viewer application, which can show several chemical file formats. OPTIONS
The following options are accepted: -b COLOR, --bgcolor=COLOR Use the given color as background color. COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#" character in the shell). -d MODEL, --display3d=MODEL Choose how molecules are displayed. MODEL can be one of "BallnStick" (default), "SpaceFill". -?, --help Show application help options. --help-all, --help-* Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7). -v, --version Print gchem3d version information. SEE ALSO
gnome-options(7), gtk-options(7) AUTHORS
Jean Brefort <jean.brefort@normalesup.org> Program author. Daniel Leidert <daniel.leidert@wgdd.de> Manpage author. COPYRIGHT
Copyright (C) 2002-2007 Jean Brefort Copyright (C) 2004-2007 Daniel Leidert Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation. gcu 0.12 $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $ GCHEM3D(1)