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Full Discussion: CASE statement
Top Forums UNIX for Dummies Questions & Answers CASE statement Post 302268373 by drl on Monday 15th of December 2008 01:21:56 PM
Old 12-15-2008
Hi.

Here are some related methods, some use seq, all use eval:
Code:
#!/bin/bash -

# @(#) s2       Demonstrate feature.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) seq
set -o nounset

echo
echo " Results:"
years="1997|1998|1999|2000|2001"

echo " With a variable:"
for i in 1990 1997 200x 2001
do
  echo " Looking for $i"
  eval "
  case $i in
    $years) echo found $i ;;
    *) echo unknown: $i ;;
  esac
  "
done

echo
echo " With command substitution:"
for i in 1990 1997 200x 2001
do
  echo " Looking for $i"
  eval "
  case $i in
    $(seq -s"|" 1997 2003)) echo found $i ;;
    *) echo unknown: $i ;;
  esac
  "
done

echo
years="$(seq -s"|" 1997 2003)|2007|2008"
echo " With combination:"
for i in 1990 1997 200x 2001 2007
do
  echo " Looking for $i"
  eval "
  case $i in
    $years) echo found $i ;;
    *) echo unknown: $i ;;
  esac
  "
done

exit 0

Producing:
Code:
% ./s2

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash 2.05b.0
seq (coreutils) 5.2.1

 Results:
 With a variable:
 Looking for 1990
unknown: 1990
 Looking for 1997
found 1997
 Looking for 200x
unknown: 200x
 Looking for 2001
found 2001

 With command substitution:
 Looking for 1990
unknown: 1990
 Looking for 1997
found 1997
 Looking for 200x
unknown: 200x
 Looking for 2001
found 2001

 With combination:
 Looking for 1990
unknown: 1990
 Looking for 1997
found 1997
 Looking for 200x
unknown: 200x
 Looking for 2001
found 2001
 Looking for 2007
found 2007

Best wishes ... cheers, drl
 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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