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Top Forums Shell Programming and Scripting Handling filenames with spaces Post 303023836 by Don Cragun on Sunday 23rd of September 2018 03:23:24 PM
Old 09-23-2018
Shell arrays are not defined by the POSIX standards and do not appear in all shells (even in all shells based on Bourne shell syntax). The Bourne shell (on which most current shells other than the csh based shells) did not include arrays. A future revision of the POSIX standards may include arrays, but no one has proposed adding that feature yet.

Note also that to declare an indexed array in bash, you use:
Code:
declare -a array_name

.
With a 1993 or later Korn shell you declare an indexed array with:
Code:
typeset -a array_name

and you declare an associative array with:
Code:
typeset -A array_name

.
I think some recent versions of bash also have associative arrays, but the version of bash available on macOS High Sierra version 10.13.6 (the OS I use) does not.

I don't know what syntax other shells that support arrays use when declaring them.

Last edited by Don Cragun; 09-23-2018 at 05:15 PM.. Reason: Correct typeset -a for indexed ksh arrays.
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list. Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1). FILES
/etc/shells list of shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.11 20 Nov 2007 shells(4)
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