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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LEARN ABOUT CENTOS
msgfilter
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)