topic Re: Unix Shell?? in Operating System - HP-UX

Unix Shell??

MO_4 — Fri, 21 Jun 2002 19:33:13 GMT

I'm new to Unix. How do I find out what Unix shell I'm using? Bourne. C, Korn, Posix???

Thanks,

MO.

Re: Unix Shell??

Patrick Wallek — Fri, 21 Jun 2002 19:36:52 GMT

Do an 'env' and grep for sh.

# env | grep sh

Re: Unix Shell??

MO_4 — Fri, 21 Jun 2002 19:40:01 GMT

uxkomni # env | grep sh
MANPATH=/usr/share/man/%L:/usr/share/man:/usr/contrib/man/%L:/usr/contrib/man:/usr/local/m
an/%L:/usr/local/man:/opt/upgrade/share/man/%L:/opt/upgrade/share/man:/usr/dt/share/man:/o
pt/pd/share/man/%L:/opt/pd/share/man:/opt/hparray/share/man:/opt/ignite/share/man/%L:/opt/
ignite/share/man:/opt/resmon/share/man:/opt/perf/man/%L:/opt/perf/man:/opt/OV/man/itose/%L
:/opt/OV/man/itose:/opt/omni/lib/man:/opt/openmail/share/man:/opt/asu/lanman/man:/opt/hpnp
l//man
HISTFILE=/.sh_history
SHELL=/sbin/sh
ENV=//.shrc

SHELL?????

Re: Unix Shell??

PIYUSH D. PATEL — Fri, 21 Jun 2002 19:41:30 GMT

Hi,

You can open the /etc/password file and check.
See against the user name.
Or

env | grep SHELL

/bin/ksh - Korne shell
/bin/sh - Bourne Shell
/bin/csh - C shell

Piyush

Re: Unix Shell??

MO_4 — Fri, 21 Jun 2002 19:48:50 GMT

/bin/sh I guess I'm running Bourne shell.

/bin/ksh - Korne shell
/bin/sh - Bourne Shell
/bin/csh - C shell

They should have put a "b" in front of the "sh".

Thanks Piyush/Patrick.

Re: Unix Shell??

Martin Johnson — Fri, 21 Jun 2002 19:50:18 GMT

/usr/bin/sh = posix shell on HPUX.

HTH
Marty

Re: Unix Shell??

Mike Hassell — Fri, 21 Jun 2002 19:50:29 GMT

MO,

Yes, SHELL is your current shell, hence you are running the default Bourne shell.

If you want to change your default shell to Korn, you would issue:

chsh /bin/ksh

Refer to the man pages if you want to learn more about how Bourne shell works:

man sh

Hope that helps.

-Mike

Re: Unix Shell??

Patrick Wallek — Fri, 21 Jun 2002 19:50:52 GMT

Nope, the 'sh' (/bin/sh, /usr/bin/sh, /sbin/sh) are HP's POSIX shell, NOT bourne.

Re: Unix Shell??

James R. Ferguson — Fri, 21 Jun 2002 19:52:02 GMT

Hi:

No, you are running the Posix (standard) shell.

'/bin/sh' is a symbolic link to /usr/bin/sh. This is the Posix shell and is most desirable.

The old Bourne shell is really:

/usr/old/bin/sh

...and you don't want that!

Regards!

...JRF...

Re: Unix Shell??

MO_4 — Fri, 21 Jun 2002 19:54:34 GMT

Hold on guys, I'm getting confused.

/usr/bin/sh means POSIX or BOURNE?

Re: Unix Shell??

PIYUSH D. PATEL — Fri, 21 Jun 2002 19:57:27 GMT

Hi,

Its the Posix shell.../usr/bin/sh.
Sorry guys...I confused all of you.

Piyush

Re: Unix Shell??

Rodney Hills — Fri, 21 Jun 2002 19:58:35 GMT

At one point in time /usr/bin/sh was bourne. And at least as far as 11.x is concerned it is now posix.

-- Rod Hills

Re: Unix Shell??

James R. Ferguson — Fri, 21 Jun 2002 20:01:15 GMT

HI (again) Mo:

HP-UX offers the POSIX shell (statically linked in /sbin/sh, and dynamically linked in /usr/bin/sh). This is the preferred shell. In fact, /sbin/sh *must* be used for the root account. Failure to do so will lead to an unbootable system.

The Posix shell is a superset of Korn.

The old Bourne shell is useless.

As for the C-shell, this is a bug-laden poor-excuse for a shell. Stay away from it.

Regards!

...JRF...

Re: Unix Shell??

MO_4 — Fri, 21 Jun 2002 20:01:20 GMT

GOT IT. I'm running POSIX.

Thank you all!!! and my hat off to HP for this wonderful forum. Honestly, I did not expect an answer so quickly. I'm hooked. My goal in the next few months is to learn all I can about Unix OS. Hopefully in a few months I'll be helping you guys out.

Thanks once again,

MO.

Re: Unix Shell??

Martin Johnson — Fri, 21 Jun 2002 20:06:24 GMT

do a "man sh" for a overview of the shells supported on HPUX.

HTH
Marty

Re: Unix Shell??

Patrick Wallek — Fri, 21 Jun 2002 20:08:13 GMT

As of 10.X the /usr/bin/sh has been POSIX, NOT bourne.

For more info on the shells do a 'man sh'. It will tell you the difference between all the shells and where they are located.

If you want some online docs have a look at:

For 10.X:
http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/A2615-90003/A2615-90003_top.html&con=/hpux/onlinedocs/A2615-90003/00/01/151-con.html&toc=/hpux/onlinedocs/A2615-90003/00/01/151-toc.html&searchterms=POSIX%7cshell&queryid=20020621-141357

Shell's user guide:
http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90046/B2355-90046_top.html&con=/hpux/onlinedocs/B2355-90046/00/00/64-con.html&toc=/hpux/onlinedocs/B2355-90046/00/00/64-toc.html&searchterms=POSIX%7cshell&queryid=20020621-141448

POSIX shell:
http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90072/B2355-90072_top.html&con=/hpux/onlinedocs/B2355-90072/00/00/10-con.html&toc=/hpux/onlinedocs/B2355-90072/00/00/10-toc.html&searchterms=POSIX%7cshell&queryid=20020621-141535

Re: Unix Shell??

Sridhar Rao — Sat, 22 Jun 2002 07:42:16 GMT

U can even use the following command to check in which shell u r working.

echo $SHELL.

Not only shell using the above command (echo $XXX. XXX is any environment variable) u can get the value of any environment variable.

Regards,
Sridhar.

Re: Unix Shell??

David Blair_2 — Mon, 24 Jun 2002 08:02:21 GMT

What's wrong with doing 'ps' to find your shell ?

Re: Unix Shell??

Gregory Fruth — Mon, 24 Jun 2002 19:25:52 GMT

"echo $SHELL" reports your login shell. It's not
necessarily the same as the shell you're currently
in:

unix% echo $SHELL
/usr/bin/tcsh
unix% ksh
unix% echo $SHELL
/usr/bin/tcsh