From: cowan@mercury.ccil.org (John Cowan)
Subject: [TUHS] History of #! interpretation in Unix
Date: Sun, 16 Jan 2011 04:55:49 -0500 [thread overview]
Message-ID: <20110116095548.GC3374@mercury.ccil.org> (raw)
In-Reply-To: <20110116084330.GA27396@minnie.tuhs.org>
Warren Toomey scripsit:
> Hi all, best wishes for 2011. I had an e-mail from Sven Mascheck asking about
> the history of #! interpretation in System V. I couldn't find any #!
> code in the kernels before SysVR4.
That's correct. The feature was added to the 8th Research edition kernel,
but didn't migrate to the System III/V line until SVR4. Shebangs began
very early in BSD as a csh-only hack, but appeared as a config option
in kernels as early as 2.8BSD, according to Wikipedia; 4.2BSD was the
first release that turned them on by default.
Perl has always (I think) had its own shebang support; you can get Perl
to exec an arbitrary interpreter for a script provided it has a shebang.
Modern shells will use /bin/sh to run scripts that *don't* have shebangs,
except for ksh which considers itself /bin/sh-compatible, and therefore
runs such scripts itself.
--
I am expressing my opinion. When my John Cowan
honorable and gallant friend is called, cowan at ccil.org
he will express his opinion. This is http://www.ccil.org/~cowan
the process which we call Debate. --Winston Churchill
next prev parent reply other threads:[~2011-01-16 9:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-16 8:43 Warren Toomey
2011-01-16 9:55 ` John Cowan [this message]
2011-01-16 13:20 ` Sven Mascheck
2011-01-16 17:17 ` John Cowan
2011-01-16 19:19 ` Sven Mascheck
2011-01-16 20:17 ` John Cowan
2011-01-16 20:42 ` Larry McVoy
2011-01-16 21:08 ` Sven Mascheck
2011-01-16 21:37 ` John Cowan
2011-01-17 16:35 ` Warner Losh
2011-01-17 20:47 ` John Cowan
2011-01-17 10:09 ` Tim Bradshaw
2011-01-16 10:53 ` Wilko Bulte
2011-01-17 16:25 ` Warner Losh
2011-01-17 19:02 ` Jeremy C. Reed
2011-01-17 20:51 ` John Cowan
2011-01-17 22:41 ` Jeremy C. Reed
2011-01-17 20:58 ` Sven Mascheck
2011-01-19 4:10 ` Cyrille Lefevre
2011-01-19 20:35 ` Sven Mascheck
2011-01-20 4:09 ` Cyrille Lefevre
2011-01-28 19:38 ` Jeremy C. Reed
2011-01-30 15:05 ` Sven Mascheck
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