06-28-2017
You have obviously both shells installed, and your code happens to be compatible to both (bash and ksh share a common language subset). Looking at your code, I guess it would also work with Zsh and Posix shell and even csh (but who wants to program in csh anyway). I don't know much about speed issues: Do you plan to write shell scripts which don't do much I/O, but mainly in-memory processing? If you are absolutely free to choose the shell, select the one which you like best. For instance, I consider Zsh most powerful and convenient from the programmer's point of view, but I know also programmers who say the same about bash or ksh.
Note also that you have to take account the version of the respective shell, because features change between versions. I would prefer working with a very recent bash over a very old Zsh....
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LEARN ABOUT OPENSOLARIS
shells
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)