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Top Forums Shell Programming and Scripting Bash sed search and replace question Post 302442201 by RickS on Tuesday 3rd of August 2010 03:05:47 PM
Old 08-03-2010
Bash sed search and replace question

I have several files that I need to modify using sed. I know how to do that, but now a new requirement has come up.

Now, I need to make changes to all lines that don't start with certain strings. For example, I need to change all lines except for lines that start with "a", "hello there", "hows_it_going" or "b".

Does sed have some sort of syntax that means "don't change the line under these conditions"?
 

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MSGFILTER(1)								GNU							      MSGFILTER(1)

NAME
msgfilter - edit translations of message catalog SYNOPSIS
msgfilter [OPTION] FILTER [FILTER-OPTION] DESCRIPTION
Applies a filter to all translations of a translation catalog. Mandatory arguments to long options are mandatory for short options too. Input file location: -i, --input=INPUTFILE input PO file -D, --directory=DIRECTORY add DIRECTORY to list for input files search If no input file is given or if it is -, standard input is read. Output file location: -o, --output-file=FILE write output to specified file The results are written to standard output if no output file is specified or if it is -. The FILTER can be any program that reads a translation from standard input and writes a modified translation to standard output. Useful FILTER-OPTIONs when the FILTER is 'sed': -e, --expression=SCRIPT add SCRIPT to the commands to be executed -f, --file=SCRIPTFILE add the contents of SCRIPTFILE to the commands to be executed -n, --quiet, --silent suppress automatic printing of pattern space Input file syntax: -P, --properties-input input file is in Java .properties syntax --stringtable-input input file is in NeXTstep/GNUstep .strings syntax Output details: --color use colors and other text attributes always --color=WHEN use colors and other text attributes if WHEN. WHEN may be 'always', 'never', 'auto', or 'html'. --style=STYLEFILE specify CSS style rule file for --color --no-escape do not use C escapes in output (default) -E, --escape use C escapes in output, no extended chars --force-po write PO file even if empty --indent indented output style --keep-header keep header entry unmodified, don't filter it --no-location suppress '#: filename:line' lines --add-location preserve '#: filename:line' lines (default) --strict strict Uniforum output style -p, --properties-output write out a Java .properties file --stringtable-output write out a NeXTstep/GNUstep .strings file -w, --width=NUMBER set output page width --no-wrap do not break long message lines, longer than the output page width, into several lines -s, --sort-output generate sorted output -F, --sort-by-file sort output by file location Informative output: -h, --help display this help and exit -V, --version output version information and exit AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2001-2010 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 msgfilter is maintained as a Texinfo manual. If the info and msgfilter programs are properly installed at your site, the command info msgfilter should give you access to the complete manual. GNU gettext-tools 0.18.2 March 2013 MSGFILTER(1)
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