Linux2011. 10. 5. 14:36
도대체 이녀석 정체가 멀까?
도움말 상으로는 test로 연결이 되는데 흐음...
쉘 스크립트에서 사용하는 [] 랑 연관이 있는걸까?

[링크 : http://linux.die.net/man/1/test


$ ll -al \[
-rwxr-xr-x 1 root root 42584 2010-09-22 03:33 [* 

$ man -k "\["
[ (1)                - check file types and compare values 

$ file [
[: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped 

% ./\[ --help
BusyBox v1.14.2 (2011-01-24 14:35:28 KST) multi-call binary

Usage: [ EXPRESSION ]

Check file types, compare values etc. Return a 0/1 exit code
depending on logical value of EXPRESSION 

/usr/bin$ ./\[ --help
사용법: test 표현식
  또는:  test
  또는:  [ 표현식 ]
  또는:  [ ]
  또는:  [ 옵션
Exit with the status determined by EXPRESSION.

      --help     이 도움말을 표시하고 끝냅니다
      --version  버전 정보를 출력하고 끝냅니다

An omitted EXPRESSION defaults to false.  Otherwise,
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
  STRING               equivalent to -n STRING
  -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
  -G FILE     FILE exists and is owned by the effective group ID
  -h FILE     FILE exists and is a symbolic link (same as -L)
  -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 read permission is granted
  -s FILE     FILE exists and has a size greater than zero
  -S FILE     FILE exists and is a socket
  -t FD       file descriptor FD is opened on a terminal
  -u FILE     FILE exists and its set-user-ID bit is set
  -w FILE     FILE exists and write permission is granted
  -x FILE     FILE exists and execute (or search) permission is granted

Except for -h and -L, all FILE-related tests dereference symbolic links.
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.

NOTE: [ honors the --help and --version options, but test does not.
test treats each of those as it treats any other nonempty STRING.

NOTE: your shell may have its own version of test and/or [, which usually supersedes
the version described here.  Please refer to your shell's documentation
for details about the options it supports.

Report [ bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report [ translation bugs to <http://translationproject.org/team/> 

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