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Negating shell interpretation

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# 15  
Old 01-22-2012
Quote:
Originally Posted by cfajohnson
[indent]

The open square bracket [ is a shell builtin command, and it is synonymous with test:
Code:
$ type test [   
test is a shell builtin
[ is a shell builtin

This I didn't realise, mostly because /usr/bin/[ seems to persist everywhere. Wrongly, I assumed it still then required a fork/exec to use it. Thanks for the correction.
# 16  
Old 01-22-2012
Quote:
Originally Posted by agama
This I didn't realise, mostly because /usr/bin/[ seems to persist everywhere. Wrongly, I assumed it still then required a fork/exec to use it. Thanks for the correction.

POSIX requires that regular built-in commands also exist as separate binaries.
# 17  
Old 01-22-2012
Quote:
Originally Posted by cfajohnson
POSIX requires that regular built-in commands also exist as separate binaries.
Indeed. One of the reasons why [/usr]/bin/cd is available in POSIX compliant OSes.
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