Re: while /usr/bin/read

On 2008-03-29, pk wrote:
> built-ins", I've never seen a /bin/cd or a /bin/alias (which nonetheless
> might exist in some implementations, although I can't imagine why an
> implementation would provide such external commands).
>
Both AIX and Solaris have /usr/bin/cd. I don't have an HP-UX system
handy to check, but I bet they have one too. Linux doesn't, but then
Linux doesn't get POSIX certification, so they don't have to tie themselves
in this sort of knot.


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Christopher Mattern

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Re: while /usr/bin/read

Chris Mattern wrote:

> Both AIX and Solaris have /usr/bin/cd. I don't have an HP-UX system
> handy to check, but I bet they have one too. Linux doesn't, but then
> Linux doesn't get POSIX certification, so they don't have to tie
> themselves in this sort of knot.

Yes, I eventually discovered (thanks to Sven) what POSIX says.
Then to turn linux into a POSIX-compliant system, one could do:

for i in alias bg cd command .... ; do
touch "/usr/bin/$i"
chmod +x "/usr/bin/$i"
done

(ok, just kidding, it's probably not so easy :-))

--
All the commands are tested with bash and GNU tools, so they may use
nonstandard features. I try to mention when something is nonstandard (if
I'm aware of that), but I may miss something. Corrections are welcome.