On Wed, 15 Sep 2010, Nigel Kersten wrote:
> Does 'type --all asdf' do the right thing on SunOS ?
According to IEEE Std 1003.1, 2004 Edition, "type" does not take
any options. Anyway, on Solaris-5.8:
for shell in /bin/sh /usr/xpg4/bin/sh /bin/ksh /usr/local/bin/bash ;
do echo "[$shell]"; ${shell} -c 'type --all asdf; echo status=$?' ;
done
[/bin/sh]
--all not found
asdf not found
status=1
[/usr/xpg4/bin/sh]
asdf not found
status=127
[/bin/ksh]
asdf not found
status=127
[/usr/local/bin/bash]
/usr/local/bin/bash: line 0: type: asdf: not found
status=1
On NetBSD-5.99.27:
for shell in /bin/sh /bin/ksh /usr/pkg/bin/bash ;
do echo "[$shell]"; ${shell} -c 'type --all asdf; echo status=$?' ;
done
[/bin/sh]
type: Illegal option --
status=2
[/bin/ksh]
/bin/ksh: whence: --: unknown option
status=1
[/usr/pkg/bin/bash]
/usr/pkg/bin/bash: line 0: type: asdf: not found
status=1
I have seen systems where "type" prints a message about "command not
found" (or words to that effect) but sets exit status 0 as if it had
been successful. I have found that "command -v" does the right thing
on the same system. Unfortunately, my notes from the time I noticed
this don't say which system had the problem, but I think it was AIX or
Cygwin.
Compare the POSIX description of the
exit status for "type" and "command" at
<http://www.opengroup.org/onlinepubs/009695399/utilities/type.html> and
<http://www.opengroup.org/onlinepubs/009695399/utilities/command.html>:
For "type" exit status >0 means "an error occurred", while for "command"
exit status >0 means "the command_name could not be found or an error
occurred".
What I take from the POSIX spec is that one could argue either way about
whether or not it's an error for the "type" command to report that a
target command does not exist; but for the "command -v" command it's
clear that nonexistence of the target command should result in non-zero
exit status.
--apb (Alan Barrett)
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