Help search and replace the last occurance of match in a file Post: 303012543

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Top Forums Shell Programming and Scripting Help search and replace the last occurance of match in a file Post 303012543 by JiaHong on Monday 5th of February 2018 06:35:35 PM

02-05-2018

Registered User

Quote:

Originally Posted by JiaHong

Hi antosr7,

This may be one of the methods:

Code:

grep "test3" <input_filename> | sed "s/ union all/;/"

where the test3 is the keyword to extract the line and the <filename> is where the three lines can be found.

Hope that this is helpful.

Thank you.

A simpler method is

Code:

sed  '3 s/ union all/;/' <filename>

where 3 is the line number. This is useful if you know which line to target at, while the grep command will search for all the lines containing the matched pattern(s).

Hope that this is useful.

Cheers.

EDIT:
Just realised that I did not really solve the problem of find and replace "the last occurrence of a match". But hope that my approach can cast a different light on the approaches used to solve your problem.

Last edited by JiaHong; 02-05-2018 at 07:40 PM.. Reason: Clarification

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zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)

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