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Top Forums Shell Programming and Scripting Need to find a string, check the next line, and if it matches certain criteria, replace it with a s Post 302371831 by frans on Monday 16th of November 2009 10:05:12 AM
Old 11-16-2009
Try this (but a sample could help !)
Code:
#!/bin/bash
Input="data.csv"
I=1
while read LINE
do    #~ find the string that starts with data7
    if [ "${LINE:0:5}" = "data7" ]
    then
        read LINE    #~ if the string on the next line has the word prisoner then replace it with the string in line 1.
        if $(echo "$LINE" | grep -q prisoner)
        then
            head -n$I "$Input" | tail -n1
            (( I ++ ))    #~ the next instance of the pattern would be replaced by the string in line 2 and so on.
        else echo "$LINE"
        fi
    else echo "$LINE"
    fi
done < "$Input" > OutputFile

 

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Mixin::Linewise::Readers(3)				User Contributed Perl Documentation			       Mixin::Linewise::Readers(3)

NAME
Mixin::Linewise::Readers - get linewise readers for strings and filenames VERSION
version 0.004 SYNOPSIS
package Your::Pkg; use Mixin::Linewise::Readers -readers; sub read_handle { my ($self, $handle) = @_; LINE: while (my $line = $handle->getline) { next LINE if $line =~ /^#/; print "non-comment: $line"; } } Then: use Your::Pkg; Your::Pkg->read_file($filename); Your::Pkg->read_string($string); Your::Pkg->read_handle($fh); EXPORTS
"read_file" and "read_string" are exported by default. Either can be requested individually, or renamed. They are generated by Sub::Exporter, so consult its documentation for more information. Both can be generated with the option "method" which requests that a method other than "read_handle" is called with the created IO::Handle. read_file Your::Pkg->read_file($filename); If generated, the "read_file" export attempts to open the named file for reading, and then calls "read_handle" on the opened handle. Any arguments after $filename are passed along after to "read_handle". read_string Your::Pkg->read_string($string); If generated, the "read_string" creates an IO::String handle from the given string, and then calls "read_handle" on the opened handle. Any arguments after $string are passed along after to "read_handle". AUTHOR
Ricardo SIGNES <rjbs@cpan.org> COPYRIGHT AND LICENSE
This software is copyright (c) 2008 by Ricardo SIGNES. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.16.3 2013-06-18 Mixin::Linewise::Readers(3)
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