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Full Discussion: Ignore all lines except the --- dash line in a text file.
Top Forums UNIX for Dummies Questions & Answers Ignore all lines except the --- dash line in a text file. Post 302954298 by bakunin on Sunday 6th of September 2015 09:26:32 PM
Old 09-06-2015
wouldn't it be easier (and perhaps faster) to use sed?

Code:
sed -n 's/^---//p' /path/to/input > /path/to/output

I hope this helps.

bakunin
 

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LEARN ABOUT SUSE

sdiff

SDIFF(1)							   User Commands							  SDIFF(1)

NAME

       sdiff - side-by-side merge of file differences

SYNOPSIS

       sdiff [OPTION]... FILE1 FILE2

DESCRIPTION

       Side-by-side merge of file differences.

       -o FILE	--output=FILE
	      Operate interactively, sending output to FILE.

       -i  --ignore-case
	      Consider upper- and lower-case to be the same.

       -E  --ignore-tab-expansion
	      Ignore changes due to tab expansion.

       -b  --ignore-space-change
	      Ignore changes in the amount of white space.

       -W  --ignore-all-space
	      Ignore all white space.

       -B  --ignore-blank-lines
	      Ignore changes whose lines are all blank.

       -I RE  --ignore-matching-lines=RE
	      Ignore changes whose lines all match RE.

       --strip-trailing-cr
	      Strip trailing carriage return on input.

       -a  --text
	      Treat all files as text.

       -w NUM  --width=NUM
	      Output at most NUM (default 130) print columns.

       -l  --left-column
	      Output only the left column of common lines.

       -s  --suppress-common-lines
	      Do not output common lines.

       -t  --expand-tabs
	      Expand tabs to spaces in output.

       --tabsize=NUM
	      Tab stops are every NUM (default 8) print columns.

       -d  --minimal
	      Try hard to find a smaller set of changes.

       -H  --speed-large-files
	      Assume large files and many scattered small changes.

       --diff-program=PROGRAM
	      Use PROGRAM to compare files.

       -v  --version
	      Output version info.

       --help Output this help.

       If a FILE is `-', read standard input.  Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.

AUTHOR

       Written by Thomas Lord.

REPORTING BUGS

       Report bugs to <bug-gnu-utils@gnu.org>.

COPYRIGHT

       Copyright (C) 2007 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for sdiff is maintained as a Texinfo manual.  If the info and sdiff programs are properly installed at your site,
       the command

	      info diff

       should give you access to the complete manual.

diffutils 2.8.7-cvs						   January 2008 							  SDIFF(1)
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