basename is a command in Mac OS X and other Unix-based systems that is used to strip the directory path and return only the base filename. It takes a file path as an argument and returns the base filename.

The syntax for basename is:

basename path [suffix]

where path is the file path and suffix is an optional argument that specifies a suffix to remove from the filename.

For example, if the file path is /usr/local/bin/script.sh, running the command basename /usr/local/bin/script.sh will return script.sh. If a suffix is specified, such as basename /usr/local/bin/script.sh .sh, the command will return script.

basename is often used in shell scripts to manipulate file names and paths.