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Wierd file name?



I'm not sure where to ask this question, but here it goes.

I was looking in /usr/bin ans see a file named:

jeff@raptor:/usr/bin$ ls -la [
-rwxr-xr-x    2 root     root        20092 Jun  2 17:05 [

jeff@raptor:/usr/bin$ ldd [
   libc.so.6 => /lib/libc.so.6 (0x40020000)
   /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

jeff@raptor:/usr/bin$ ./[ --help

Usage: ./[ EXPRESSION
 or:  [ EXPRESSION ]
 or:  ./[ OPTION
Exit with the status determined by EXPRESSION.

 --help      display this help and exit
 --version   output version information and exit

EXPRESSION is true or false and sets exit status.  It is one of:

 ( EXPRESSION )               EXPRESSION is true
 ! EXPRESSION                 EXPRESSION is false
EXPRESSION1 -a EXPRESSION2 both EXPRESSION1 and EXPRESSION2 are true EXPRESSION1 -o EXPRESSION2 either EXPRESSION1 or EXPRESSION2 is true
 [-n] STRING          the length of STRING is nonzero
 -z STRING            the length of STRING is zero
 STRING1 = STRING2    the strings are equal
 STRING1 != STRING2   the strings are not equal

 INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2
 INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2
 INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2
jeff@raptor:/usr/bin$ ./[ --help
Usage: ./[ EXPRESSION
 or:  [ EXPRESSION ]
 or:  ./[ OPTION
Exit with the status determined by EXPRESSION.

 --help      display this help and exit
 --version   output version information and exit

EXPRESSION is true or false and sets exit status.  It is one of:

 ( EXPRESSION )               EXPRESSION is true
 ! EXPRESSION                 EXPRESSION is false
EXPRESSION1 -a EXPRESSION2 both EXPRESSION1 and EXPRESSION2 are true EXPRESSION1 -o EXPRESSION2 either EXPRESSION1 or EXPRESSION2 is true
 [-n] STRING          the length of STRING is nonzero
 -z STRING            the length of STRING is zero
 STRING1 = STRING2    the strings are equal
 STRING1 != STRING2   the strings are not equal

 INTEGER1 -eq INTEGER2   INTEGER1 is equal to INTEGER2
 INTEGER1 -ge INTEGER2   INTEGER1 is greater than or equal to INTEGER2
 INTEGER1 -gt INTEGER2   INTEGER1 is greater than INTEGER2
 INTEGER1 -le INTEGER2   INTEGER1 is less than or equal to INTEGER2
 INTEGER1 -lt INTEGER2   INTEGER1 is less than INTEGER2
 INTEGER1 -ne INTEGER2   INTEGER1 is not equal to INTEGER2

 FILE1 -ef FILE2   FILE1 and FILE2 have the same device and inode numbers
 FILE1 -nt FILE2   FILE1 is newer (modification date) than FILE2
 FILE1 -ot FILE2   FILE1 is older than FILE2

 -b FILE     FILE exists and is block special
 -c FILE     FILE exists and is character special
 -d FILE     FILE exists and is a directory
 -e FILE     FILE exists
 -f FILE     FILE exists and is a regular file
 -g FILE     FILE exists and is set-group-ID
 -h FILE     FILE exists and is a symbolic link (same as -L)
 -G FILE     FILE exists and is owned by the effective group ID
 -k FILE     FILE exists and has its sticky bit set
 -L FILE     FILE exists and is a symbolic link (same as -h)
 -O FILE     FILE exists and is owned by the effective user ID
 -p FILE     FILE exists and is a named pipe
 -r FILE     FILE exists and is readable
 -s FILE     FILE exists and has a size greater than zero
 -S FILE     FILE exists and is a socket
 -t [FD]     file descriptor FD (stdout by default) is opened on a terminal
 -u FILE     FILE exists and its set-user-ID bit is set
 -w FILE     FILE exists and is writable
 -x FILE     FILE exists and is executable

Beware that parentheses need to be escaped (e.g., by backslashes) for shells.
INTEGER may also be -l STRING, which evaluates to the length of STRING.

Report bugs to <bug-sh-utils@gnu.org>.
jeff@raptor:/usr/bin$


anybody know is this a valid file, and if so, what is it?




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