Bash: if condition as variable Post: 302397035

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Top Forums Shell Programming and Scripting Bash: if condition as variable Post 302397035 by curlee2002 on Saturday 20th of February 2010 01:24:28 PM

02-20-2010

Registered User

[SOLVED] Bash: if condition as variable

Thank You, Franklin52.

Adding eval after the if did the trick. I added it on line 28 of the test script below.

my final test script

Code:

#!/bin/bash
#test.sh

fileType=( avi flv iso mkv mp4 mpeg mpg wmv )

if [ -n "$1" ]
then
   inputFileName="$1"
   echo "\$1 = $1"
   echo "inputFileName = $inputFileName"
else
   for inputFileName in *
   do
      if [ -f "$inputFileName" ]
         then
            echo -e "\ninputFileName = $inputFileName"
            fileNameExt=`echo $inputFileName|sed 's/.*\.//'`
            predicate="[ \"$fileType\" = \"$fileNameExt\" ]"

            if [ ${#fileType[@]} != 0 ]
            then
               i="1"
               while [ $i -lt ${#fileType[@]} ]
               do
                  predicateN=""
                  predicateN=`echo -e "$predicateN|| [ \"${fileType[i]}\" = \"$fileNameExt\" ]"`
                  predicate="$predicate $predicateN"
                  i=$[$i+1]
               done
            fi

            if eval "$predicate"
            then
               echo "yes, $inputFileName has a usable file extension."
            fi
      fi
   done
fi

exit

sample output

Code:

$ ./test.sh 

inputFileName = bill.mkv
yes, bill.mkv has a usable file extension.

inputFileName = bob.mkv
yes, bob.mkv has a usable file extension.

inputFileName = examples.desktop

Last edited by curlee2002; 02-20-2010 at 02:35 PM..

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bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)

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