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Full Discussion: Cd
Top Forums UNIX for Dummies Questions & Answers Cd Post 7924 by Perderabo on Wednesday 3rd of October 2001 01:52:08 PM
Old 10-03-2001
I do see that language on the sun man page. Hp's man page is more rational:
Quote:
cd exists only as a shell built-in command because a new process is created whenever a command is executed, making cd useless if written and processed as a normal system command.
That language preceeds the existence of /usr/bin/cd, they should now drop the "only" from the sentence.

With HP-UX, 10.0 was the first release to have /usr/bin/cd. No earlier version of HP-UX had one.
It really is new. It was never used by any shell. There is no way to write a shell that uses /usr/bin/cd. There never was any way to write a shell that uses /usr/bin/cd in any release of any version of unix. /usr/bin/cd is virually useless.
 
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)
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