Compact script with array - Good idea? Post: 302676225

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Top Forums Shell Programming and Scripting Compact script with array - Good idea? Post 302676225 by Spadez on Tuesday 24th of July 2012 09:35:43 AM

07-24-2012

Registered User

Compact script with array - Good idea?

Hi,

I have a shell script where a lot of the code is repeated. I wanted to make the code much more compact so I spoke to a guy and he suggested using arrays, like follows:

Code:

#!/bin/bash

readonly -a nginx=('nginx' '--prefix=/opt'  '-j 4'
    'http://nginx.org/download/nginx-1.2.2.tar.gz' 
)
readonly -a supervisor=('supervisor' '--prefix=/opt'  '-j 4'
    'http://pypi.python.org/packages/source/s/supervisor/supervisor-3.0a12.tar.gz'
)

# Download, configure, build and install the given application array
#
# $1 is an application array
#
# Note: The four first lines are used to correctly get the array parameter
# - Setting the shell's Internal Field Separator to null
# - Create a string containing "array content"
# - assign app value to $1[*] using indirect variable reference
# - Resetting IFS to default
#
#
function install()
{
    OLD_IFS=$IFS; IFS=''; 
    local array_string="$1[*]" 
    local app=(${!array_string})
    IFS=$OLD_IFS

    echo "Installing '${app[0]}' from '${app[3]}' "
    echo "configure '${app[1]}'"
    echo "make '${app[2]}'"
}

install nginx
install supervisor

I like this, because not only is the code nice and short, but it stops repetition where operations are similar, for example downloading files.

Is there anything wrong with doing this?

Spadez

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LEARN ABOUT DEBIAN

shunit2

SHUNIT2(1)																SHUNIT2(1)

NAME

       shunit2 - A unit test framework for shell scripts

SYNOPSIS

       shunit2 unitfile

DESCRIPTION

       shUnit2 is a xUnit unit test framework for Bourne based shell scripts, and it is designed to work in a similar manner to JUnit, PyUnit,
       etc.. If you have ever had the desire to write a unit test for a shell script, shUnit2 can do the job.

       You can either run shunit2 directly from the commandline and specify the unit file or directly source the shunit2 executable.

       If you directly execute shunit2 and don't specify a unitfile shunit2 assumes a empty testfile and will return without an error message.

EXAMPLE

       Simple script to test if 1 equals 1

	   #! /bin/sh
	   testEquality()
	   {
	     assertEquals 1 1
	   }

	   # load shunit2
	   . shunit2

       Execute shUnit2 unit tests directly from the commandline

	   shunit2 /path/to/unit/file

OPTIONS

       shunit2 does not support any commandline options at all. You can either source shunit2 to execute your unit tests or directly run shunit2
       as a commandline script.

SEE ALSO

       For more information see http://code.google.com/p/shunit2/ or have a look at the installed documentation in /usr/share/doc/shunit2/

AUTHOR

       shunit2 was written by Kate Ward <kate.ward@forestent.com>. This manpage was written by Ulrich Dangel <mru@spamt.net>.

  2.1.6 							    03/25/2012								SHUNIT2(1)