Library: GNU bash Command Reference (Darwin 9.0)

test

test: test [expr]

Exits with a status of 0 (true) or 1 (false) depending on
the evaluation of EXPR.  Expressions may be unary or binary.  Unary
expressions are often used to examine the status of a file.  There
are string operators as well, and numeric comparison operators.

File operators:

-a FILE        True if file exists.
-b FILE        True if file is block special.
-c FILE        True if file is character special.
-d FILE        True if file is a directory.
-e FILE        True if file exists.
-f FILE        True if file exists and is a regular file.
-g FILE        True if file is set-group-id.
-h FILE        True if file is a symbolic link.
-L FILE        True if file is a symbolic link.
-k FILE        True if file has its `sticky' bit set.
-p FILE        True if file is a named pipe.
-r FILE        True if file is readable by you.
-s FILE        True if file exists and is not empty.
-S FILE        True if file is a socket.
-t FD          True if FD is opened on a terminal.
-u FILE        True if the file is set-user-id.
-w FILE        True if the file is writable by you.
-x FILE        True if the file is executable by you.
-O FILE        True if the file is effectively owned by you.
-G FILE        True if the file is effectively owned by your group.
-N FILE        True if the file has been modified since it was last read.

FILE1 -nt FILE2  True if file1 is newer than file2 (according to
modification date).

FILE1 -ot FILE2  True if file1 is older than file2.

FILE1 -ef FILE2  True if file1 is a hard link to file2.

String operators:

-z STRING      True if string is empty.

-n STRING
STRING         True if string is not empty.

STRING1 = STRING2
True if the strings are equal.
STRING1 != STRING2
True if the strings are not equal.
STRING1 < STRING2
True if STRING1 sorts before STRING2 lexicographically.
STRING1 > STRING2
True if STRING1 sorts after STRING2 lexicographically.

Other operators:

-o OPTION      True if the shell option OPTION is enabled.
! EXPR         True if expr is false.
EXPR1 -a EXPR2 True if both expr1 AND expr2 are true.
EXPR1 -o EXPR2 True if either expr1 OR expr2 is true.

arg1 OP arg2   Arithmetic tests.  OP is one of -eq, -ne,
-lt, -le, -gt, or -ge.

Arithmetic binary operators return true if ARG1 is equal, not-equal,
less-than, less-than-or-equal, greater-than, or greater-than-or-equal
than ARG2.

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