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Shell Programming and Scripting
Stupid question to check if variable is empty
Post 302925904 by RudiC on Thursday 20th of November 2014 05:39:01 AM
11-20-2014
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How to check the variable is empty or not?
aaa=" "
how to check aaa variable is empty or just spacing?
If only spacing inside.. it will asume it is empty.
some are 6 spacing, or 8 spacing.. as long as variable is empty with spacing..
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hi,
i want to check whether a a variable contains some value or is empty in a shell script. so if the variable contains some value i want to do some job and if the variable doesnt contain any value then i need to skip that job.
here is a sample script
read_filenames.sh contains
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LEARN ABOUT MOJAVE
ppi::token::quote::double5.18
PPI::Token::Quote::Double(3) User Contributed Perl Documentation PPI::Token::Quote::Double(3) NAME
PPI::Token::Quote::Double - A standard "double quote" token INHERITANCE
PPI::Token::Quote::Double isa PPI::Token::Quote isa PPI::Token isa PPI::Element DESCRIPTION
A "PPI::Token::Quote::Double" object represents a double-quoted interpolating string. The string is treated as a single entity, PPI will not try to understand what is in the string during the parsing process. METHODS
There are several methods available for "PPI::Token::Quote::Double", beyond those provided by the parent PPI::Token::Quote, PPI::Token and PPI::Element classes. Got any ideas for methods? Submit a report to rt.cpan.org! interpolations The interpolations method checks to see if the double quote actually contains any interpolated variables. Returns true if the string contains interpolations, or false if not. simplify For various reasons, some people find themselves compelled to have their code in the simplest form possible. The "simply" method will turn a simple double-quoted string into the equivalent single-quoted string. If the double can be simplified, it will be modified in place and returned as a convenience, or returns false if the string cannot be simplified. SUPPORT
See the support section in the main module. AUTHOR
Adam Kennedy <adamk@cpan.org> COPYRIGHT
Copyright 2001 - 2011 Adam Kennedy. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module. perl v5.18.2 2011-02-25 PPI::Token::Quote::Double(3)