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Top Forums Shell Programming and Scripting Get nth occurence of string from a file Post 302941017 by Don Cragun on Saturday 11th of April 2015 03:31:18 AM
Old 04-11-2015
Quote:
Originally Posted by r@v!7*7@
Thanks a lot. That was really helpful.
But even though I changed it to below, it is replacing mutiple occurrence's. Am I missing something.
Code:
sub(ERE,rep,$2)

Using gsub(ERE,rep,2 replaces every string matched by ERE in field 2 on each line with the replacement string indicated by rep.

Using sub(ERE,rep,2 replaces the 1st string matched by ERE in field 2 on each line with the replacement string indicated by rep.

With the sample input you provided and the sample output you said you wanted, both of these do exactly what you said you wanted. You did not provide any sample input with the string test appearing two or more times in field 2 on a line where the 1st field on that line is the string 03.
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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