16 Jan
2011
16 Jan
'11
3:55 p.m.
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.
--
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he will express his opinion. This is http://www.ccil.org/~cowan
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