Unusual file: /bin/[
Hi, I spotted what i'd call an unusual file in the basejail on a jail install, and have since seen this on other non jailed boxes. -r-xr-xr-x 2 root wheel 11488 Jun 10 12:19 [ man [ reveals test, [ -- condition evaluation utility just checking thats all ok, and i've not been rooted! -- - Paul Macdonald IFDNRG Ltd Web and video hosting - t: 0131 5548070 m: 07970339546 e: p...@ifdnrg.com w: http://www.ifdnrg.com - IFDNRG 40 Maritime Street Edinburgh EH6 6SA High Specification Dedicated Servers from £100.00pm ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Unusual file: /bin/[
On 07/29/13 15:25, Paul Macdonald wrote: Hi, I spotted what i'd call an unusual file in the basejail on a jail install, and have since seen this on other non jailed boxes. -r-xr-xr-x 2 root wheel 11488 Jun 10 12:19 [ That's a perfectly valid UNIX program used in (bourne) shell programming. It has been part of BSD Unix for ages. And I really mean AGES! just checking thats all ok, and i've not been rooted! Don't worry about it. It's perfectly legitimate. -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Unusual file: /bin/[
That's a real binary, also known as /bin/test ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: Unusual file: /bin/[
On Mon, 29 Jul 2013 14:25:08 +0100, Paul Macdonald wrote:
Hi, I spotted what i'd call an unusual file in the basejail on a jail
install, and have since seen this on other non jailed boxes.
-r-xr-xr-x 2 root wheel 11488 Jun 10 12:19 [
man [ reveals
test, [ -- condition evaluation utility
just checking thats all ok, and i've not been rooted!
The [ program is the same as the test program. It's
a valid file name and it's often used in shell scripts
instead of test.
% ll /bin/test /bin/\[
-r-xr-xr-x 2 root wheel 8336 2011-08-21 20:23:20 /bin/[*
-r-xr-xr-x 2 root wheel 8336 2011-08-21 20:23:20 /bin/test*
Consider shell scripts. When you have a script with something like
if [ -f bla.txt ]; then
... some stuff ...
fi
it is the same as
if test -f bla.txt; then
... some stuff ...
fi
It's also often being used like
[ -x blah.sh ] do_something
which is identical to calling test and acting upon the value
of the return code.
Nothing to worry here.
YOu can _always_ counter-check by building /usr/src/bin/test
from source and compare the resulting binary. Both /bin/[
and /bin/test are usually installed as hardlinks (two file
names for one / for _the same_ file), as seen in the
corresponding Makefile:
LINKS= ${BINDIR}/test ${BINDIR}/[
So it's not _that_ unusual. ;-)
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: Unusual file: /bin/[
On Mon, 29 Jul 2013 14:25:08 +0100
Paul Macdonald wrote:
Hi, I spotted what i'd call an unusual file in the basejail on a jail
install, and have since seen this on other non jailed boxes.
-r-xr-xr-x 2 root wheel 11488 Jun 10 12:19 [
man [ reveals
test, [ -- condition evaluation utility
just checking thats all ok, and i've not been rooted!
The idea was to make shell scripts more readable as you can have
something like:
if [ ${x} -gt 1 ] ...
[ is a hard-link to /bin/test and the closing] ] is its last argument.
In most modern shells its a builtin feature and /bin/[ isn't used.
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Re: Unusual file: /bin/[
On Mon, 29 Jul 2013 15:45:10 +0200 cpghost cpgh...@cordula.ws wrote: On 07/29/13 15:25, Paul Macdonald wrote: Hi, I spotted what i'd call an unusual file in the basejail on a jail install, and have since seen this on other non jailed boxes. -r-xr-xr-x 2 root wheel 11488 Jun 10 12:19 [ That's a perfectly valid UNIX program used in (bourne) shell programming. It has been part of BSD Unix for ages. And I really mean AGES! grin I recall someone deciding that /bin/[ looked iffy and deleted it from a FreeBSD 1.1.5.1 box busy serving connections to a bunch of dial up users. An amazing number of things stopped working. -- Steve O'Hara-Smith st...@sohara.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
