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Top Forums Shell Programming and Scripting How to rewrite a line in a file Post 302117416 by c0384 on Monday 14th of May 2007 08:48:18 AM
Old 05-14-2007
Quote:
Originally Posted by aigles
To replace line 2 :
Code:
sed '2c\
200 3000' infile > outfile

With awk:
Code:
awk 'NR==2 {print "200 3000"; next} 1' infile > outfile


Jean-Pierre.
Thanks everyone for valuable suggestions.

I tried both commands suggested by aigles but it doesnt work. I got errors which indicating syntax error if I am not mistaken.
However, Shell Life commands work well.

I wish to extend my questions base on the question I posted the other day.
How about only change the 2nd word on the second line of the file? For example
HELLO
179.390 111.560
HOW TO DO
WHAT TO DO

to become

HELLO
179.390 50000
HOW TO DO
WHAT TO DO
 

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String::RewritePrefix(3)				User Contributed Perl Documentation				  String::RewritePrefix(3)

NAME
String::RewritePrefix - rewrite strings based on a set of known prefixes VERSION
version 0.007 SYNOPSIS
use String::RewritePrefix; my @to_load = String::RewritePrefix->rewrite( { '' => 'MyApp::', '+' => '' }, qw(Plugin Mixin Addon +Corporate::Thinger), ); # now you have: qw(MyApp::Plugin MyApp::Mixin MyApp::Addon Corporate::Thinger) You can also import a rewrite routine: use String::RewritePrefix rewrite => { -as => 'rewrite_dt_prefix', prefixes => { '' => 'MyApp::', '+' => '' }, }; my @to_load = rewrite_dt_prefix( qw(Plugin Mixin Addon +Corporate::Thinger)); # now you have: qw(MyApp::Plugin MyApp::Mixin MyApp::Addon Corporate::Thinger) METHODS
rewrite String::RewritePrefix->rewrite(\%prefix, @strings); This rewrites all the given strings using the rules in %prefix. Its keys are known prefixes for which its values will be substituted. This is performed in longest-first order, and only one prefix will be rewritten. If the prefix value is a coderef, it will be executed with the remaining string as its only argument. The return value will be used as the prefix. AUTHOR
Ricardo Signes <rjbs@cpan.org> COPYRIGHT AND LICENSE
This software is copyright (c) 2013 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 v5.18.2 2013-10-15 String::RewritePrefix(3)
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