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The best implementation of ksh93 is Tksh that allows to use TCL on top of ksh93:

Tksh is an implementation of the Tcl C library written on top of the library for the new KornShell (ksh93). Tksh emulates the behavior of Tcl by using the API that is provided for extending ksh93, which is similar to the Tcl library in that it allows access to variables, functions and other state of the interpreter. This implementation allows Tcl libraries such as Tk to run on top of ksh93 unchanged, making it possible to use shell scripts in place of Tcl scripts. ksh93 is well suited for use with Tk because it is backward compatible with sh, making it both easy to learn and easy to extend existing scripts to provide a graphical user interface. Tksh is not yet another port of Tk to another language -- it allows Tcl scripts to run without modification using the ksh93 internals.

As stated on the AT&T software download selections page (it has binaries for most flavors of Unix in existence):

KSH-93 provides the following features, many of which were also inherent in KSH-88:

Documentation for KSH-93 consists of an "Introduction to KSH-93", "Compatibility with the Bourne Shell" and a manual page and a README file. In addition, the "New KornShell Command and Programming Language," book is available from Prentice Hall.

David Korn is one of the very few "recordsmen" in maintaining his software product. He actually maintained it since 1983, than means for more then 20 years ! The current version (as of Jan, 2005) of ksh93 is ksh93q released Dec 1, 2004.

Anyway Korn shell is a more powerful instrument than either C-shell or bash. Two major versions exist ksh88 and ksh93. The latest (Ksh93) version is more powerful than bash 2.0/3.0 and is the best commercial shell available. Ksh93 is now free for educational and private use. The only shell that can complete with ksh93 featurewise is probably zsh.  the unique feature of ksh93 is that it has a really high-quality Windows implementation, see U/Win project homepage . UWIN provides the following functionality for WIN32 applications:

Process control and management:
While processes can be created using the fork(2) function, UWIN includes a spawn family of functions that combines the functionality of fork/exec for efficiency. With the exec family of functions, an existing process can be overlaid with another process. Each process has a unique process id and each process belongs to a process group. The vfork(2) function is also an efficient way to create processes.
File descriptor semantics:
Open files, pipes, sockets, fifos, and character and block special devices files have file descriptors associated with them. They can be duped and inherited with UNIX semantics.
UNIX signal semantics:
Nearly all of the UNIX signals are provided, including job control signals so that ksh(1) can stop and restart jobs. A process can catch, block or ignore signals. Signals can be sent to processes or to process groups. Applications compiled with the -D_BSDCOMPAT flag obey UCB UNIX signal semantics.
Support for devices:
UWIN provides character and block devices with major and minor numbers as found on UNIX systems. Support for direct access to floppy drives (/dev/fd0), and SCSI tape drives (/dev/mt0), as well as ptys and ttys is available.
Terminal interface for consoles, sockets, and serial lines:
The POSIX termios interface is supported for consoles with vt100 emulation. Serial lines, and sockets that have been designated as virtual terminals. UWIN supports pseudo-ttys.
Use of the mouse with console windows:
The left mouse button in a console window can be used to select text and copy to the clipboard. The right button (or middle button on a three button mouse) can be used to paste text from the clipboard. The /dev/clipboard pseudo-device can be used to redirect command input and output to the clipboard. The /dev/windows pseudo-device can be used within select(2) to block until mouse or keyboard events are received.
UCB sockets based on WINSOCK:
The socket interface uses the UCB header files and naming conventions, but is implemented as calls to WINSOCK. Sockets are file descriptors and obey file descriptor semantics. Both internet domain protocol (i.e. AF_INET family) and UNIX domain sockets (AF_UNIX family) are provided. The multicast socket protocol is supported. The connect stream library, which provides a higher level and easier to user interface, is also provided.
Pathname mapping from UNIX to Windows:
UWIN provides UNIX style naming for all files with / as the filename delimiter by creating mounts. The / directory location can be selected at installation. Each drive letter in Windows is mounted in a single letter directory name under / so that /a/file is the UWIN name for a:\file. In addition, certain directories are implicitly mounted such as /sys on the system directory, /win on the windows directory, and /msdev on the directory containing the Microsoft development kit if installed. The character and block special devices are in /dev and use naming conventions found on most UNIX systems. UWIN also supports UNC (universal naming convention) names for files that begin with //. An API function is provided to map the UNIX name into the Windows name. The mapping is available from ksh as well.
UNIX naming conventions:
The PATH variable is a : separated list of directories rather than a ; separated list. The cc command generates files with a .o suffix by default. However, some characters such as \, *, ?, |, &, <. >, and : are not valid as part of file names. By default, directories are mounted without case distinction. However, the mount command allows directories to be mounted as case sensitive so that the files makefile and Makefile are distinct. In addition, there is a registry key that can be set to make the default case sensitive.
Mapping to and from UNIX ids/permissions to NT/2000/XP permissions:
Windows NT/2000/XP subject identifiers are mapped to UNIX user ids and group ids. UNIX permissions are mapped onto Windows NT/2000/XP file ACLs. The Administrator can use chown() to change the owner and or group of a file.
File control locking:
UNIX file control advisory locking is supported by UWIN with deadlock detection.
Memory mapping and shared memory:
Both mmap() and the system V shared memory facilities are provided.
System V IPC:
The System V semaphore and message calls are implemented.
Runtime linking of dynamically linked libraries:
The dlopen(), dlsym() interface from System V Release 4 is provided.
Error mapping from Windows to UNIX:
Errors returned by WIN32 functions are mapped into UNIX errnos.
i-node numbers:
An i-node number is returned when reading a file and when stating a file.
Hard links:
Hard links are supported on both NTFS and FAT file systems.
Symbolic links:
Symbolic links to files and directories can be created in UWIN and are implemented as Windows shortcuts. A .lnk suffix will be appended to these file names but will not appear when reading directories with UWIN. Shortcuts created by Windows appear as symbolic links in UWIN but do not have the .lnk suffix removed.
Fifo's (UNIX named pipes) can be created with mkfifo() and opened as an ordinary file.
Setuid and setgid programs:
Users can authorize setuid and/or setgid programs to be run on their behalf and use chmod() to turn on setuid permission for a program. The program must be on an NTFS file system.
inet Daemons and commands:
UWIN 3.2 comes with the UCB inet daemon, the telnet daemon, the rlogin daemon, and the rsh daemon. It also includes the telnet, ftp, rsh, and rlogin programs. The ssh daemon and program can be built from the source but is not included because of possible export restrictions.
Access of Registry through the File System:
UWIN treats the Windows registry as a file system with registry keys treated as files, and keys that have sub-keys treated as directories. You can use UWIN tools directly on registry keys. The registry is automatically mounted under /reg during startup.
ssh and ssh daemon:
A compilation of openssh-3.6p1. Cron daemon: UWIN comes with a cron daemon that is used for running at and cron jobs. The cron daemon is started by /etc/rc on Windows NT/2000/XP.
AT&T open source utilities:
Most of the UWIN utilities are based on the AT&T open source utilities that are portable across virtually all systems and are based on the POSIX and X/Open standards. The utilities generate their own manual pages.
Development tools:
UWIN comes with cc and ncc compiler wrappers that use the Visual C/C++ compiler to build UWIN or native applications respectively. Development tools such as yacc, lex, ar, nm and rcs are also provided. UWIN provides both the traditional make and the much more powerful AT&T nmake building tool.
Support for multibyte locales:
Most of the utilities and libraries support localization to different locales including multibyte locales. The iconv utility can be used to convert from one character set to another. X11 server and utilities: A compilation of X11R6.5 is available as add on packages.

For shell programming ksh93 is still the best shell around. In the absence of a better one, as long as you apply the right magic to your .kshrc you can get around some limitations. To get some decent command line editing do a 'set -o emacs', to get the arrow keys etc to work

alias __A=`/bin/echo "\020"` # Up 
	alias __B=`/bin/echo "\016"# Down alias
	 __C=`/bin/echo "\006"` # Right alias
	  __D=`/bin/echo "\002"`	# Left alias 
	  __H=`/bin/echo "\001"` # Home alias
	   __p=`/bin/echo "\004"` # Delete 
	   alias __q=`/bin/echo "\005"` # End alias 
	   __z=`/bin/echo "\017"` # Clea

(The previous works on Solaris, it might need some tweaking for different forms of echo) Unfortunately, I don't know of an easy way to get TAB to do filename completion (the default is ESC ESC in ksh93).

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