Table of Contentstest - check file types and compare values test [expr]
test {--help,--version} 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.
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.
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