Yes, it is valid file name.
In any case it exists in FreeBSD too.
this file is useful for shell programming.
when you program in shell like
if [ $something != $something_other ]
then some shells execute "[" as a program that checks this epression.
Hope it helps.
Saturday, June 30, 2001, 17:18:56, hpknight wrote:
h> -rwxr-xr-x 2 root root 20092 Jun 2 17:05 /usr/bin/test
h> looks like someone might have copied/renamed it on accident in a shell
h> script.
h> -hpknight
h> On Sat, 30 Jun 2001, lists wrote:
>> I'm not sure where to ask this question, but here it goes.
>>
>> I was looking in /usr/bin ans see a file named:
>>
>> jeff@raptor:/usr/bin$ 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 <[EMAIL PROTECTED]>.
>> jeff@raptor:/usr/bin$
>>
>>
>> anybody know is this a valid file, and if so, what is it?
>>
>>
>>
>> --
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