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Full Discussion: Read file and replace a particular line if found
Top Forums Shell Programming and Scripting Read file and replace a particular line if found Post 302807671 by adisky123 on Wednesday 15th of May 2013 06:26:28 AM
Old 05-15-2013
Read file and replace a particular line if found
Hi All
There is another challenge which stand in front of me. And want all to have the experience with that

I have a file in Unix say a.txt. What I was trying is to read the file line by line and matching the line to particular pattern, and if that pattern found I want to replace that line with that particular pattern.

I know there are several ways to do, but I want to do it in that way only due to some large process constraints

Regards
Adi
 

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LEARN ABOUT CENTOS

exigrep

EXIGREP(8)                                                    System Manager's Manual                                                   EXIGREP(8)

NAME

       EXIGREP - Search Exim's main log

SYNOPSIS

       exigrep [-l] pattern [log file] ...

DESCRIPTION

       The  exigrep  utility  is  a  Perl script that searches one or more main log files for entries that match a given pattern.  When it finds a
       match, it extracts all the log entries for the relevant message, not just those that match the pattern.  Thus, exigrep can extract complete
       log entries for a given message, or all mail for a given user, or for a given host, for example.

       The -l flag means 'literal', that is, treat all characters in the pattern as standing for themselves.  Otherwise the pattern must be a Perl
       regular expression.  The pattern match is case-insensitive.  If no file names are given on the command line, the standard input is read.

       If the location of a zcat command is known from the definition of ZCAT_COMMAND in Local/Makefile, exigrep  automatically  passes  any  file
       whose name ends in COMPRESS_SUFFIX through zcat as it searches it.

BUGS

       This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches
       would be greatly appreciated.

SEE ALSO

       exim(8), perlre(1), /usr/share/doc/exim4-base/

AUTHOR

       This manual page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian  GNU/Linux  system
       (but may be used by others).

                                                                  March 26, 2003                                                        EXIGREP(8)
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