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Full Discussion: Using GREP in IF Statement
Top Forums Shell Programming and Scripting Using GREP in IF Statement Post 302811443 by Ariean on Thursday 23rd of May 2013 02:26:52 PM
Old 05-23-2013
(1)
Quote:
Originally Posted by Yoda
Please note that square brackets [] that contain the statement are a synonym for the 'test' command.

So it is expecting a valid expression and it is failing because the command that you put inside doesn't meet the criteria.

This is why you don't need a square bracket [] to wrap the command.

The grep command returns the exit status 0 or non-zero which if statement can check and transfer the control to corresponding action.
Isn't greping for a string "ERROR" is also a test? what do you mean by test? you mean comparing 2 variables or values using -eq for numbers and == for strings or a -z or -n for zero & nonzero byte strings, something like that...Can you please explain a bit more with example

(2) I am trying the below script to check 2 conditions

Code:
#!/bin/bash
PATH="/db_apps/informatica/infa951/server/infa_shared/BWParam/wf_GenerateXMLDataFile.txt"
UNINUM="92500"
echo $UNINUM

        if  /bin/grep -q "UNINUM" $PATH -a -z ${UNINUM}
        then
                echo "success"
        else
                echo "failure"
        fi

But it always returns success, i am confused.

Thank you.
Last edited by Ariean; 05-23-2013 at 03:33 PM..
 

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LEARN ABOUT DEBIAN

ppi::statement::unknown

PPI::Statement::Unknown(3pm)				User Contributed Perl Documentation			      PPI::Statement::Unknown(3pm)

NAME

       PPI::Statement::Unknown - An unknown or transient statement

INHERITANCE

	 PPI::Statement::Unknown
	 isa PPI::Statement
	     isa PPI::Node
		 isa PPI::Element

DESCRIPTION

       The "PPI::Statement::Unknown" class is used primarily during the lexing process to hold elements that are known to be statement, but for
       which the exact "type" of statement is as yet unknown, and requires further tokens in order to resolve the correct type.

       They should not exist in a fully parse valid document, and if any exists they indicate either a problem in Document, or possibly (by
       allowing it to get through unresolved) a bug in PPI::Lexer.

METHODS

       "PPI::Statement::Unknown" has no additional methods beyond the default ones provided by PPI::Statement, PPI::Node and PPI::Element.

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 v5.10.1							    2011-02-26					      PPI::Statement::Unknown(3pm)
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