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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 HPUX

dirname

basename(1)						      General Commands Manual						       basename(1)

NAME

       basename, dirname - extract portions of path names

SYNOPSIS

       string [suffix]

       [string]

DESCRIPTION

       deletes	any  prefix  ending in and the suffix (if present in string) from string, and prints the result on the standard output.  If string
       consists entirely of slash characters, string is set to a single slash character.  If there are any trailing slash  characters  in  string,
       they  are removed.  If the suffix operand is present but not identical to the characters remaining in string, but it is identical to a suf-
       fix of the characters remaining in string, the suffix is removed from string.  is normally used inside command  substitution  marks  within
       shell procedures.

       delivers  all but the last level of the path name in string.  If string does not contain a directory component, returns indicating the cur-
       rent working directory.

EXTERNAL INFLUENCES

   Environment Variables
       determines the interpretation of string and, in the case of basename, suffix as single and/or multi-byte characters.

       If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
       able.   If  is  not  specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization
       variable contains an invalid setting, and behave as if all internationalization variables are set to "C".  See environ(5).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

EXAMPLES

       The following shell script, invoked with the argument compiles the named file and moves the output to a file named in  the  current  direc-
       tory:

       The following example sets the shell variable to

RETURN VALUE

       and return one of the following values:

	      Successful completion.
	      Incorrect number of command-line arguments.

SEE ALSO

       expr(1), sh(1).

STANDARDS CONFORMANCE

																       basename(1)
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