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Full Discussion: ksh vs bash
Operating Systems Solaris ksh vs bash Post 302321769 by otheus on Tuesday 2nd of June 2009 05:38:32 AM
Old 06-02-2009
My answer: because ksh is (1) installed by default on more systems, and (2) is generally available no matter what boot mode (ie, single-user), and (3) older admins don't know/care about 3rd party (ie, GNU) tools. Also, (4) because of (1), you can write shell scripts that are more "portable".

In terms of capabilities, I doubt there are many differences between bash and ksh. But there are subtle differences that can and will break shell scripts.
 

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LEARN ABOUT SUNOS

suspend

suspend(1)							   User Commands							suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10							    15 Apr 1994 							suspend(1)
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