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Full Discussion: [BASH - KSH] Passing array to a function
Top Forums Shell Programming and Scripting [BASH - KSH] Passing array to a function Post 302186038 by ripat on Wednesday 16th of April 2008 10:28:38 AM
Old 04-16-2008
[BASH - KSH] Passing array to a function
Passing a array to a function, a basic feature in modern language, seems to be only possible in KSH. Not in BASH. Depite all my efforts I couldn't come to a solution. See the following examples:

It works perfectly in KSH:
Code:
#!/usr/bin/ksh

function print_array {
    # assign array by indirect variable reference (namerefs)
    typeset -n array=$1

    # display array content
    echo "${array[*]}"
}

colors=('Pink' 'Light Gray' 'Green')

print_array "colors"

But this one gave me headhache:
Code:
#!/bin/bash

function print_array {
    # trying to assign array by indirect variable reference
    declare -a array=${!1}
    # local array=${!1}         # doesn't work either

    # display array content
    echo "${array[*]}"
}

colors=('Pink' 'Light Gray' 'Green')

print_array "colors"

Some reference in the manual for using indirect reference in BASH:
http://tldp.org/LDP/abs/html/bashver2.html#VARREFNEW
 

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LEARN ABOUT DEBIAN

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
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