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Full Discussion: Why does /bin contain binaries for builtins?
Top Forums UNIX for Dummies Questions & Answers Why does /bin contain binaries for builtins? Post 302489389 by methyl on Thursday 20th of January 2011 10:27:13 AM
Old 01-20-2011
Use the "type" command. The "which" command just searches down the current PATH.
Code:
type pwd
pwd is a shell builtin
type /usr/bin/pwd
/usr/bin/pwd is /usr/bin/pwd

You can override the Shell builtin by specifying the full path to the binary e.g. " /usr/bin/pwd".
There can be subtle differences when you are in a directory which is soft-linked to another directory. Try it.

Code:
# HP-UK with Posix Shell
ls -lad /usr/tmp
lrwxrwxrwt   1 root       sys              8 May  7  2003 /usr/tmp -> /var/tmp
cd /usr/tmp
pwd
/usr/tmp

/usr/bin/pwd
/var/tmp

 

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LEARN ABOUT OPENSOLARIS

shells

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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