test(1)

     NAME
          test - check file types and compare values

     SYNOPSIS
          test [expr]
          test {--help,--version}

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of test.  Note
          that most shells have a built-in command by the same name
          and with similar functionality.

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

          -b file
               True if file exists and is block special.
          -c file
               True if file exists and is character special.
          -d file
               True if file exists and 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 exists and is set-group-id.
          -k file
               True if file has its ``sticky'' bit set.
          -L file
               True if file exists and is a symbolic link.
          -p file
               True if file exists and is a named pipe.
          -r file
               True if file exists and is readable.
          -s file
               True if file exists and has a size greater than zero.
          -S file
               True if file exists and is a socket.
          -t [fd]
               True if fd is opened on a terminal.  If fd is omitted,
               it defaults to 1 (standard output).
          -u file
               True if file exists and its set-user-id bit is set.
          -w file
               True if file exists and is writable.
          -x file
               True if file exists and is executable.
          -O file
               True if file exists and is owned by the effective user
               id.
          -G file
               True if file exists and is owned by the effective group
               id.
          file1 -nt file2
               True if file1 is newer (according to modification date)
               than file2.
          file1 -ot file2
               True if file1 is older than file2.
          file1 -ef file2
               True if file1 and file2 have the same device and inode
               numbers.
          -z string
               True if the length of string is zero.
          -n string
          string
               True if the length of string is non-zero.
          string1 = string2
               True if the strings are equal.
          string1 != string2
               True if the strings are not equal.
          ! 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
               OP is one of -eq, -ne, -lt, -le, -gt, or -ge.  These
               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,
               respectively.  arg1 and arg2 may be positive integers,
               negative integers, or the special expression -l string,
               which evaluates to the length of string.
        OPTIONS
          When GNU test is invoked with exactly one argument, the
          following options are recognized:
          --help
               Print a usage message on standard output and exit
               successfully.
          --version
               Print version information on standard output then exit
               successfully.