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Top Forums Shell Programming and Scripting Use awk to update only 2nd line Post 303026170 by Sandeep on Wednesday 21st of November 2018 09:31:39 AM
Old 11-21-2018
Use awk to update only 2nd line

I have a file and need to update the specific position on line two. I tried to use this solution under the post "Awk command to replace specific position characters"


But need a way to just limit to update the line 2 and not every line on the file.

Code:
awk 'function repl(s,f,t,v) { return substr(s,1,f-1) sprintf("%-*s", t-f+1, v) substr(s,t+1) } { a=repl($0,37,46,"0000000002")   print a }' infile

Can someone help.

Last edited by vgersh99; 11-21-2018 at 10:48 AM.. Reason: Code tags, please!
 

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Devel::REPL::Plugin::MultiLine::PPI(3pm)		User Contributed Perl Documentation		  Devel::REPL::Plugin::MultiLine::PPI(3pm)

NAME
Devel::REPL::Plugin::MultiLine::PPI - read lines until all blocks are closed SYNOPSIS
#!/usr/bin/perl use lib './lib'; use Devel::REPL; my $repl = Devel::REPL->new; $repl->load_plugin('LexEnv'); $repl->load_plugin('History'); $repl->load_plugin('MultiLine::PPI'); $repl->run; DESCRIPTION
Plugin that will collect lines until you have no unfinished structures. This lets you write subroutines, "if" statements, loops, etc. more naturally. For example, without a MultiLine plugin, $ my $x = 3; 3 $ if ($x == 3) { will throw a compile error, because that "if" statement is incomplete. With a MultiLine plugin, $ my $x = 3; 3 $ if ($x == 3) { > print "OH NOES!" > } OH NOES 1 you may write the code across multiple lines, such as in "irb" and "python". This module uses PPI. This plugin is named "MultiLine::PPI" because someone else may conceivably implement similar behavior some other less dependency-heavy way. SEE ALSO
"Devel::REPL" AUTHOR
Shawn M Moore, "<sartak at gmail dot com>" COPYRIGHT AND LICENSE
Copyright (C) 2007 by Shawn M Moore This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-05-19 Devel::REPL::Plugin::MultiLine::PPI(3pm)
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