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Full Discussion: check if a variable contains a string
Top Forums UNIX for Advanced & Expert Users check if a variable contains a string Post 302277242 by bakunin on Thursday 15th of January 2009 06:32:34 PM
Old 01-15-2009
Quote:
Originally Posted by melanie_pfefer
is there a better solution that gets the last string and removes the trailing slash if it exists?

thanks.
What is a "better" solution? Less clockcycles to run? Less characters to type? Less seconds needed to come up with?

All the mentioned solutions use an external tool (basename, grep, etc.), which means the script has to load a program an run that and only after its completion it can resume its work. This costs some amount of time. If you do it only rarely you will barely notice the difference, if you do it in the middle of a loop which is often executed you will notice a severe difference.

Having said this, here is a solution completely done in shell only - no external tools used:

Code:
# x="/a/b/c/d/e"        # uncomment this and comment the next line - no difference
x="/a/b/c/d/e/"
y="f"                   # comment this, uncomment the following line and run again
# y="e"                 

x="${%%x/}"      # remove trailing slash if there is one
if [ "${x##*/}" = "$y" ] ; then
     echo "x and y are equal"
else
     echo "x and y are different"
fi

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

mdom::token::comment

MDOM::Token::Comment(3pm)				User Contributed Perl Documentation				 MDOM::Token::Comment(3pm)

NAME

       MDOM::Token::Comment - A comment in Makefile source code

INHERITANCE

	 MDOM::Token::Comment
	 isa MDOM::Token
	     isa MDOM::Element

SYNOPSIS

	 # This is a MDOM::Token::Comment

	 foo: bar # So is this one
	       echo 'hello'

DESCRIPTION

       In MDOM, comments are represented by "MDOM::Token::Comment" objects.

       These come in two flavours, line comment and inline comments.

       A "line comment" is a comment that stands on its own line. These comments hold their own newline and whitespace (both leading and trailing)
       as part of the one "MDOM::Token::Comment" object.

       An inline comment is a comment that appears after some code, and continues to the end of the line. This does not include whitespace, and
       the terminating newlines is considered a separate MDOM::Token::Whitespace token.

       This is largely a convenience, simplifying a lot of normal code relating to the common things people do with comments.

       Most commonly, it means when you "prune" or "delete" a comment, a line comment disappears taking the entire line with it, and an inline
       comment is removed from the inside of the line, allowing the newline to drop back onto the end of the code, as you would expect.

       It also means you can move comments around in blocks much more easily.

       For now, this is a suitably handy way to do things. However, I do reserve the right to change my mind on this one if it gets dangerously
       anachronistic somewhere down the line.

METHODS

       Only very limited methods are available, beyond those provided by our parent MDOM::Token and MDOM::Element classes.

   line
       The "line" accessor returns true if the "MDOM::Token::Comment" is a line comment, or false if it is an inline comment.

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2006 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 v5.12.4							    2011-08-28						 MDOM::Token::Comment(3pm)
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