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01-29-2007, 08:16 AM
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#1
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Member
Registered: Sep 2003
Location: Tokyo
Distribution: Red Hat
Posts: 41
Rep:
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What is this file: /usr/bin/[
ls -al /usr/bin/[
-rwxr-xr-x 1 root root 31048 Jan 11 00:06 /usr/bin/[
This file can also be found in FC5 as well. Just curious...
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01-29-2007, 08:44 AM
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#2
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Senior Member
Registered: Sep 2005
Location: France
Distribution: approximately NixOS (http://nixos.org)
Posts: 1,900
Rep:
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It is executable similar or identical to 'test' executable. It is invoked when you use constructs like 'if [ -f file ]; then echo yes; fi;'. Here '[' is just a command name, not a special syntax character.
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01-29-2007, 08:48 AM
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#3
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LQ Guru
Registered: Sep 2003
Location: Bologna
Distribution: CentOS 6.5 OpenSuSE 12.3
Posts: 10,509
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Raskin told that! As a proof you can safely do
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01-29-2007, 09:07 AM
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#4
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Member
Registered: Dec 2006
Location: Bracknell, UK
Distribution: SUSE 13.1
Posts: 159
Rep:
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Strictly, I think that command only exists for use by shells where the "[" command isn't a shell builtin - eg. in bash, writing "if [ ..." doesn't run the /usr/bin/[ program, but other shells might need it.
bash-2.03$ type [
[ is a shell builtin
bash-2.03$
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01-29-2007, 09:17 AM
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#5
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Senior Member
Registered: Sep 2005
Location: France
Distribution: approximately NixOS (http://nixos.org)
Posts: 1,900
Rep:
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I would add that it is so in bash invoked as bash, and not /bin/sh which often links to /bin/bash. And it can be used not only by shells, but also by any other programs... I am not sure if POSIX requires providing executable capable to handle 'test' invocation.
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02-04-2007, 03:17 AM
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#6
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Member
Registered: Sep 2003
Location: Tokyo
Distribution: Red Hat
Posts: 41
Original Poster
Rep:
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Thank you all gentlemen!
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