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118 lines
4.7 KiB
HTML
118 lines
4.7 KiB
HTML
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<TITLE> www/ksh/ksh.mm mm document </TITLE>
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<!--INDEX--><!--/INDEX-->
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<P>
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<P><CENTER><FONT color=red><FONT face=courier><H3><A name="ksh overview">ksh overview</A></H3></FONT></FONT></CENTER>
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The
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<STRONG>KornShell</STRONG>
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language was designed and developed by David G. Korn at AT&T Bell Laboratories and AT&T Research.
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It is an interactive command language that provides access to the UNIX system and to many other systems,
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on the many different computers and workstations on which it is implemented.
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The
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<STRONG>KornShell</STRONG>
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language is also a complete, powerful, high-level programming language for writing applications,
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often more easily and quickly than with other high-level languages.
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This makes it especially suitable for prototyping.
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There are two other widely used shells, the Bourne shell developed by Steven Bourne at AT&T Bell Laboratories,
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and the C shell developed by Bill Joy at the University of California.
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<STRONG>ksh</STRONG>
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has the best features of both, plus many new features of its own.
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Thus
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<STRONG>ksh</STRONG>
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can do much to enhance your productivity and the quality of your work,
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both in interacting with the system, and in programming.
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<STRONG>ksh</STRONG>
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programs are easier to write, and are more concise and readable than programs written in a lower level language such as C.
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<P>
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The new version of
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<STRONG>ksh</STRONG>
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has the functionality of other scripting languages such as awk, icon, perl, rexx, and tcl.
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For this and many other reasons,
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<STRONG>ksh</STRONG>
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is a much better scripting language than any of the other popular shells.
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The code size for
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<STRONG>ksh</STRONG>
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is larger than the Bourne shell or C shell programs.
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The revised version is even larger.
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<P>
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In spite of its increased size,
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<STRONG>ksh</STRONG>
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provides better performance.
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You can write programs to run faster with
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<STRONG>ksh</STRONG>
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than with either the Bourne shell or the C shell, sometimes an order of magnitude faster.
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<STRONG>ksh</STRONG>
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has evolved and matured with extensive user feedback.
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It has been used by many thousands of people at AT&T since 1982, and at many other companies and universities.
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A survey conducted at one of the largest AT&T Bell Laboratories computer centers showed that 80% of their customers, both programmers and non-programmers, use
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<STRONG>ksh.</STRONG>
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<STRONG>ksh</STRONG>
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is compatible with the Bourne shell.
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Virtually all programs written for the Bourne shell run with
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<STRONG>ksh.</STRONG>
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If you are familiar with the Bourne shell, you can use
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<STRONG>ksh</STRONG>
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immediately, without retraining.
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The new version of
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<STRONG>ksh</STRONG>
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is compatible with earlier versions of
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<STRONG>ksh.</STRONG>
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<STRONG>ksh</STRONG>
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is readily available.
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It is sold (source and binary) by AT&T and Novell, and by other companies under license from AT&T both in the USA and abroad.
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It has been purchased by dozens of major corporations, and by many individuals for use on home computers.
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<STRONG>ksh</STRONG>
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is extensible.
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<P>
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The
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<STRONG>KornShell</STRONG>
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language uses the same syntax for built-in commands as for non built-in commands.
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Therefore, system developers can add new commands "transparently" to the
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<STRONG>KornShell</STRONG>
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language; that is, with minimum effort and with no differences visible to users other than faster execution.
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On systems with dynamic linking, it is possible to add new built-in commands at run time.
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Novell has extended the new version of
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<STRONG>ksh</STRONG>
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to enable X-windows programming for their desktop
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<STRONG>ksh</STRONG>
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product,
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<STRONG>dtksh</STRONG>.
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<STRONG>dtksh</STRONG>
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is a standard part of CDE, the Common Desktop Environment defined by COSE (Common Operating System Environment), supported by most major UNIX system hardware vendors.
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An extended version of
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<STRONG>ksh</STRONG>
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that enables Tk programming, called tksh, is available as well.
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<P>
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<STRONG>ksh</STRONG>
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is intended to conform to the Shell Language Standard developed by the IEEE POSIX 1003.2 Shell and Utilities Language Committee.
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<P>
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<HR>
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<TABLE border=0 align=center width=96%>
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<TR>
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<TD align=left></TD>
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<TD align=center></TD>
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<TD align=right>March 13, 2012</TD>
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</TR>
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<P>
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