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Shell Programming and Scripting
How can I use a variable in sed?
Post 51669 by Perderabo on Thursday 27th of May 2004 04:15:15 PM
05-27-2004
For starters, you can switch to double quotes:
sed "s/mytext/$var/"
Sometimes that does not work. It would depend on the exact value of mytext. So another solution is to turn the single quoted string into two single quoted strings:
sed 's/mytext/'$var'/'
In this case, the 2nd single quoted string is '/'. Just using a backslash would work to that and it saves a character:
sed 's/mytext/'$var\/
There is actually no reason to quote a slash so this should also work with most shells:
sed 's/mytext/'$var/
And there may be no reason to quote anything at all, but again, the actual vakue of mytext determines this. So this may work:
sed s/mytext/$var/
Opps...you only wanted a solution, so I'll quit now....
sed "s/mytext/$var/"
Sometimes that does not work. It would depend on the exact value of mytext. So another solution is to turn the single quoted string into two single quoted strings:
sed 's/mytext/'$var'/'
In this case, the 2nd single quoted string is '/'. Just using a backslash would work to that and it saves a character:
sed 's/mytext/'$var\/
There is actually no reason to quote a slash so this should also work with most shells:
sed 's/mytext/'$var/
And there may be no reason to quote anything at all, but again, the actual vakue of mytext determines this. So this may work:
sed s/mytext/$var/
Opps...you only wanted a solution, so I'll quit now....
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LEARN ABOUT CENTOS
template::plugin::wrap
Template::Plugin::Wrap(3) User Contributed Perl Documentation Template::Plugin::Wrap(3) NAME
Template::Plugin::Wrap - Plugin interface to Text::Wrap SYNOPSIS
[% USE wrap %] # call wrap subroutine [% wrap(mytext, width, initial_tab, subsequent_tab) %] # or use wrap FILTER [% mytext FILTER wrap(width, initital_tab, subsequent_tab) %] DESCRIPTION
This plugin provides an interface to the Text::Wrap module which provides simple paragraph formatting. It defines a "wrap" subroutine which can be called, passing the input text and further optional parameters to specify the page width (default: 72), and tab characters for the first and subsequent lines (no defaults). [% USE wrap %] [% text = BLOCK %] First, attach the transmutex multiplier to the cross-wired quantum homogeniser. [% END %] [% wrap(text, 40, '* ', ' ') %] Output: * First, attach the transmutex multiplier to the cross-wired quantum homogeniser. It also registers a "wrap" filter which accepts the same three optional arguments but takes the input text directly via the filter input. Example 1: [% FILTER bullet = wrap(40, '* ', ' ') -%] First, attach the transmutex multiplier to the cross-wired quantum homogeniser. [%- END %] Output: * First, attach the transmutex multiplier to the cross-wired quantum homogeniser. Example 2: [% FILTER bullet -%] Then remodulate the shield to match the harmonic frequency, taking care to correct the phase difference. [% END %] Output: * Then remodulate the shield to match the harmonic frequency, taking care to correct the phase difference. AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/> The Text::Wrap module was written by David Muir Sharnoff with help from Tim Pierce and many others. COPYRIGHT
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Template::Plugin, Text::Wrap perl v5.16.3 2011-12-20 Template::Plugin::Wrap(3)