Today I found something really interesting (at least to me) on one of our test servers:
I can change into an existing directory from my actual working directory using a relative path, but that very same directory is not listed when using
Here is the shell session (as
$ pwd /you/are/here $ ls -a . .. <-- Note: "somedir" is not shown to root $ echo $CDPATH $ cd somedir <-- But still: "cd" works fine $ pwd /you/are/here/somedir $ cd .. $ pwd /you/are/here $ ls -a . ..
Could someone tell me, how is this possible at all? I have checked:
ls is from
/bin/pwd, both from their original package (I mean: not hacked).
/you is a mounted EMC disk (ext3). And
somedir exists as I can list the contents of it (there are several subdirs, files). Its name does not start with a dot.
Some more shell session, with more info about the commands and the
root@U-TEST@AT$/bin/ls -ali total 4 16515074 drwxrwxr-x 2 U8000966 test 2048 Sep 1 07:39 . 16515073 drwxrwxr-x 3 U8000966 test 2048 Apr 27 2006 .. root@U-TEST@AT$ls -ali somewhere | head -5 total 182 16515075 drwxrwxr-x 43 U8000966 test 2048 Sep 1 07:39 . 16515074 drwxrwxr-x 2 U8000966 test 2048 Sep 1 07:39 .. 16519169 drwxrwxrwx 4 U8000966 test 2048 Jul 25 2007 AAA 16515124 drwxrwxr-x 3 U8000966 test 2048 May 12 2006 BBB root@U-TEST@AT$type ls ls is aliased to `/bin/ls $LS_OPTIONS' root@U-TEST@AT$type pwd pwd is a shell builtin root@U-TEST@AT$/bin/pwd /you/are/here root@U-TEST@AT$cd somewhere root@U-TEST@AT$/bin/pwd /you/are/here/somewhere root@U-TEST@AT$type cd cd is a shell builtin
Please note the Total 4 after the first
ls -ali. (I don't know if it's relevant...)
Some more tests:
root@UR-TEST@AT$ls . .. root@U-TEST@AT$touch somewhere/testfile root@U-TEST@AT$ls . .. root@U-TEST@AT$cp somewhere/testfile ./ root@U-TEST@AT$ls . .. testfile root@U-TEST@AT$du . 2 . root@URBIS-TEST@AT$
And EMC is: http://www.emc.com/products/family/disk-library-family.htm , but they are only a disk provider in this case, with hard disks, formatted as ext3.
(Sorry, but yesterday I had to leave)
I did check
echo *, and its output is:
. ... Here are the
-a -N --color=tty -T 0.
I had checked the automount thing mentioned by Gilles, but as I had changed to
somewhere and issued a
mount|grep somewhere there were no output.
Here is the
strace output as suggested: http://gist.github.com/566947