ksh bug fix and enhancement update

An updated ksh package that fixes multiple bugs and adds one enhancement is now
available for Red Hat Enterprise Linux 5.

KSH-93 is the most recent version of the KornShell by David Korn of AT&T Bell
Laboratories. KornShell is a shell programming language which is also compatible
with sh, the original Bourne Shell.

This updated ksh package includes numerous bug fixes and one enhancement. Space
precludes documenting all of these changes in this advisory. Users are directed
to the Red Hat Enterprise Linux 5.8 Technical Notes for information on the most
significant of these changes:

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.8_Technical_Notes/ksh.html#RHBA-2012-0159

All users of ksh are advised to upgrade to this updated package, which fixes
these bugs and adds this enhancement.

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

573936 - [PATCH] read in a ksh script in utf-8 locale does not restore tty settings
584704 - Return of a command substitution from within another command substitution causes stdin of coprocess to be closed in a ksh script
586923 - ksh memory leak significantly slows the execution of shell scripts
587127 - whence -q broken
615284 - wrong redirections with SIGPIPE traps
616853 - ksh crashes
640379 - pipefail option causes intermittent failure of 'ls|! grep'
642508 - ksh doesn't close the file including the function definition
644128 - problem with here-doc in function called from here-doc
647524 - completion after an environment variable results in a "bad substitution" error
650998 - The dot command may misdirect output
659459 - In ksh scripts, files may be created but then fail to be immediately opened.
683722 - ksh crashes when IFS is unset inside a function
691850 - misprocessing of invalid PID argument for ksh built-in kill
699641 - KSH default path missing 'cwd' /bin:/usr/bin missing colon at the end
709774 - ksh handling variable assignment with the use of multiple pipes and different variable assignment mechanisms
726199 - wait fails on pid of co-process
727891 - ksh crashes when IFS is unset inside a function - PART 2
743302 - ksh script never comes back
747249 - Dereference of uninitialized value (ksh)

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.8_Technical_Notes/ksh.html#RHBA-2012-0159