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Shell Programming and Scripting

which shell?

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# 1  
Old 10-23-2005
Java which shell?
HP-UX B.11.11 U 9000/800 (tb)

in /etc/passwd :
SHELL=/sbin/sh

in man sh :
Code:
 _________________________________________
 |  To obtain:   |    Use the command:   |
 |_______________|_______________________|
 | POSIX Shell   |  /usr/bin/sh ...      |
 | Korn Shell    |  /usr/bin/ksh ...     |
 | C Shell       |  /usr/bin/csh ...     |
 | Key Shell     |  /usr/bin/keysh       |
 | Bourne Shell  |  /usr/old/bin/sh ...  |
 |_______________|_______________________|

little bit confusing..
i like to know which shell i am using?... ie /sbin/sh is posix shell or bourne shell?..
Last edited by Perderabo; 10-23-2005 at 05:04 PM.. Reason: Add code tags and clean up table for readability
# 2  
Old 10-23-2005
/sbin/sh is a statically linked version of the bourne shell. It is the correct shell for the root user, for several reasons, not least of which is that if you accidentally delete something the dynamically linked shells depends on your root shell still works and you stand a reasonably good chance of being able to fix it. It is also used during boot, before /usr is mounted and as such it is the only working shell at that point.

Some people do change the root login shell, personally I think that doing so is at best foolish. It takes less than a second to type the command for a preferred shell such as ksh tcsh or bash.
Last edited by reborg; 10-23-2005 at 06:51 PM.. Reason: spelling
# 3  
Old 10-23-2005
Quote:
Originally Posted by reborg
/sbin/sh is a stically linked version of the bourne shell.
Not on HP-UX...
Code:
$ uname -srm
HP-UX B.11.11 9000/800
$ file /usr/bin/sh /sbin/sh
/usr/bin/sh:    PA-RISC1.1 shared executable dynamically linked
/sbin/sh:       PA-RISC1.1 shared executable
$ exec /sbin/sh
$ [[ +123 = ?(+|-)+([0-9]) ]] && echo +123 is an integer
+123 is an integer
$

On HP-UX, the Bourne shell has been retired and is only available in /usr/old/bin/sh. All other shells named sh are Posix shells. The HP-UX Posix shell is basicly ksh88 with a few tweaks for strict Posix compatibility. So /sbin/sh is a staticly linked Posix shell.
# 4  
Old 10-23-2005
Oops my bad, I missed the very first line and am so used to dealing with Solaris that I responded on autopilot.
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