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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platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)