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Full Discussion: perl search and replace - search in first line and replance in 2nd line
Top Forums Shell Programming and Scripting perl search and replace - search in first line and replance in 2nd line Post 302493947 by durden_tyler on Friday 4th of February 2011 09:37:33 AM
Old 02-04-2011
Code:
$
$
$ # show the contents of the data file called "f4"
$
$ cat f4
tmp,123 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
abc,666
,10:1
tmp,111 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
tmp,123 --- if match tmp,??? then replace below line
,10:1 --- replace as ,10:50
aaa,666
,10:1 -- do not replace as above line is not matching "tmp,???"
,10:1 -- do not replace as above line is not matching "tmp,???"
$
$
$ # run the Perl one-liner that processes the data in the file "f4"
$
$ perl -plne 'if(/^tmp,\d{3}/) {$x=1} elsif($x) {$_=",10:50"; $x=0}' f4
tmp,123 --- if match tmp,??? then replace below line
,10:50
abc,666
,10:1
tmp,111 --- if match tmp,??? then replace below line
,10:50
tmp,123 --- if match tmp,??? then replace below line
,10:50
aaa,666
,10:1 -- do not replace as above line is not matching "tmp,???"
,10:1 -- do not replace as above line is not matching "tmp,???"
$
$

tyler_durden
 

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LEARN ABOUT DEBIAN

sagasu

sagasu(1)																 sagasu(1)

NAME

       sagasu - GNOME tool to find strings in multiple files

SYNOPSIS

       sagasu [string [dir]]

DESCRIPTION

       sagasu  is  a  GNOME  tool to find strings in a set of files.  The user specifies the search directory and the set of files to be searched.
       Double-clicking on a search result launches a user command that can for example load the file in an editor at the  appropriate  line.   The
       search can recurse into subdirectories and can optionally ignore CVS directories.

       Two  optional  command-line arguments can be given: the first is the initial search string and the second is the directory whose files will
       be searched.  If only one argument is given, it is taken as the search string.  No search is actually started, but the  appropriate  fields
       are initialized.  Any subsequent arguments are ignored.

       More documentation is available through the application's Help menu.

OPTIONS

       --help display a help page and exit

       --version
	      display version information and exit

LICENSE

       This  program  is free software; you may redistribute it under the terms of the GNU General Public License.  This program has absolutely no
       warranty.

AUTHOR

       Pierre Sarrazin

       See the Sagasu Home Page:
       http://sarrazip.com/dev/sagasu.html

BUGS

       The files to be searches are still assumed to be in Latin-1, not in UTF-8.  The same goes for the command-line arguments and  the  terminal
       to which Sagasu is connected, if applicable.

HISTORY

       Sagasu is a Japanese word that means "to search."

								  June 19th, 2010							 sagasu(1)
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