Sh vs bash


 
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# 8  
Old 08-06-2014
@wisecracker. No matter what you assign to n inside the loop, it does not matter, since n is given its next value by the for statement just before printing, but this is off topic and should be in another thread...
# 9  
Old 08-06-2014
I think it was the original Bourne shell. I just tried it on Solaris 10 (where /bin/sh is the classic Bourne Shell):
Code:
$ /bin/sh ./t | grep Total
Total Programs 0
Total Lines 0
$ /usr/xpg4/bin/sh ./t | grep Total
Total Programs 50
Total Lines 787310
$ bash ./t | grep Total
Total Programs 50
Total Lines 787310
$ ksh ./t | grep Total
Total Programs 50
Total Lines 787310

So apparently the Bourne Shell is using a subshell for a while loop even when only redirecting input..

Last edited by Scrutinizer; 08-06-2014 at 07:18 PM..
# 10  
Old 08-06-2014
SCO ships with 3 Bourne Shells.
/u95/bin/sh which is aware of files larger than 2gb
/usr/bin/posix/sh which I never knew about.
/bin/sh which is the default shell when creating new users and is the only one that displays this problem.
# 11  
Old 08-06-2014
/usr/bin/posix/sh must be a Posix shell or a link to one.

According to this SCO 7 (UnixWare 7) man page:
sh(1)

Quote:
The version of sh residing in /usr/bin/sh is the Bourne shell and is described in this manual page. The version residing in /u95/bin/sh is a version of the Korn Shell that complies with X/Open Interface Definitions, Version 4 Issue 2.
So it appears of the three only /bin/sh is a Bourne Shell (probably a link to /usr/bin/sh or vice versa)

Last edited by Scrutinizer; 08-06-2014 at 08:25 PM..
# 12  
Old 08-07-2014
In my experience, on Linux sh is just a soft link to bash.
# 13  
Old 08-07-2014
Interesting. So this basic, fundamental behavior which most everyone would depend on today is not fundamental Bourne behavior! It's probably POSIX but not old-fashioned, bug-compatible-with-1970 Bourne.
# 14  
Old 08-07-2014
Quote:
Originally Posted by achenle
In my experience, on Linux sh is just a soft link to bash.
This is oftenly true but sometimes it is not. On Ubuntu-based systems (and maybe all other Debian-based ones too?) "sh" is a "dash".

I hope this helps.

bakunin
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