File type tests (GNU Coreutils 9.0)

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16.3.1 File type tests

These options test for particular types of files. (Everything’s a file, but not all files are the same!)

‘-b file’

True if file exists and is a block special device.

‘-c file’

True if file exists and is a character special device.

‘-d file’

True if file exists and is a directory.

‘-f file’

True if file exists and is a regular file.

‘-h file’
‘-L file’

True if file exists and is a symbolic link. Unlike all other file-related tests, this test does not dereference file if it is a symbolic link.

‘-p file’

True if file exists and is a named pipe.

‘-S file’

True if file exists and is a socket.

‘-t fd’

True if fd is a file descriptor that is associated with a terminal.