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Full Discussion: How to filter only comments while reading a file including line break characters.
Top Forums Shell Programming and Scripting How to filter only comments while reading a file including line break characters. Post 302418239 by Franklin52 on Monday 3rd of May 2010 03:24:14 PM
Old 05-03-2010
Quote:
Originally Posted by kchinnam
Code:
$> awk 'NF && $1 != "#"{sub("#.*","");print}' input.txt
awk: syntax error near line 1
awk: bailing out near line 1

I needed to use xpg4 version of awk on my Solaris8 box.

Code:
$>/usr/xpg4/bin/awk 'NF && $1 != "#"{sub("#.*","");print}' input.txt
one="1111111" 
two="22222222"
        three=333333333

Frank That is great., Its working..
Do you have any ideas to trim prefix spaces also?

I am not sure what we are getting by added complexity.. here.. Dan Please explain what the intent is ..

Code:
$>/usr/xpg4/bin/awk '$1!="#" && NF{gsub(/^ */,"",$0);sub("#.*",x);print}' input.txt
one="1111111" 
two="22222222"
        three=333333333

Again,, Please give me ideas to trim space characters at the beginning of lines. I know something line
Code:
cat input.txt | awk '{print $1}'

can do that,, but is there a more elegant one ?
Try:
Code:
awk 'NF && $1 != "#"{sub("#.*","");sub(/^ */,"");print}' file

 

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LEARN ABOUT CENTOS

vorbiscomment

VORBISCOMMENT(1)						 Ogg Vorbis Tools						  VORBISCOMMENT(1)

NAME

       vorbiscomment - List or edit comments in Ogg Vorbis files

SYNOPSIS

       vorbiscomment [-l] [-R] [-e] file.ogg
       vorbiscomment -a [ -c commentfile | -t "name=value" ] [-q] [-R] [-e] in.ogg [out.ogg]
       vorbiscomment -w [ -c commentfile | -t "name=value" ] [-q] [-R] [-e] in.ogg [out.ogg]

DESCRIPTION

       vorbiscomment Reads, modifies, and appends Ogg Vorbis audio file metadata tags.

OPTIONS

       -a, --append
	      Append comments.

       -c file, --commentfile file
	      Take comments from a file. The file is the same format as is output by the -l option or given to the -t option: one element per line
	      in 'tag=value' format. If the file is /dev/null and -w was passed, the existing comments will be removed.

       -h, --help
	      Show command help.

       -l, --list
	      List the comments in the Ogg Vorbis file.

       -t 'name=value', --tag 'name=value'
	      Specify a new tag on the command line. Each tag is given as a single string. The part before the '=' is treated as the tag name  and
	      the part after as the value.

       -w, --write
	      Replace  comments  with  the new set given either on the command line with -t or from a file with -c. If neither -c nor -t is given,
	      the new set will be read from the standard input.

       -R, --raw
	      Read and write comments in UTF-8, rather than converting to the user's character set.

       -e, --escapes
	      Quote/unquote newlines and backslashes in the comments. This ensures every comment is exactly one line in  the  output  (or  input),
	      allowing	to  filter and round-trip them. Without it, you can only write multi-line comments by using -t and you can't reliably dis-
	      tinguish them from multiple one-line comments.

	      Supported escapes are c-style "
", "
", "\" and "". A backslash followed by anything else is an error.

	      Note: currently, anything after the first "" is thrown away while writing.  This is a bug -- the Vorbis format	can  safely  store
	      null characters, but most other tools wouldn't handle them anyway.

       -V, --version
	      Display the version of vorbiscomment.

EXAMPLES

       To just see what comment tags are in a file:

	   vorbiscomment -l file.ogg

       To edit those comments:

	   vorbiscomment -l file.ogg > file.txt
	   [edit the comments in file.txt to your satisfaction]
	   vorbiscomment -w -c file.txt file.ogg newfile.ogg

       To simply add a comment:

	   vorbiscomment -a -t 'ARTIST=No One You Know' file.ogg newfile.ogg

       To add a set of comments from the standard input:

	   vorbiscomment -a file.ogg
	   ARTIST=No One You Know
	   ALBUM=The Famous Album
	   <ctrl-d>

TAG FORMAT

       See  http://xiph.org/vorbis/doc/v-comment.html  for documentation on the Ogg Vorbis tag format, including a suggested list of canonical tag
       names.

AUTHORS

       Program Authors:
	      Michael Smith <msmith@xiph.org>
	      Ralph Giles <giles@xiph.org>

       Manpage Author:
	      Christopher L Cheney <ccheney@debian.org>

SEE ALSO

       oggenc(1), oggdec(1), ogg123(1), ogginfo(1)

Xiph.Org Foundation						 December 30, 2008						  VORBISCOMMENT(1)
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