[5] MetaComCo TRIPOS and AmigaDOS provide a similar MakeDir command to create new directories.

[10] Digital Research DR DOS 6.0[11] and Datalight ROM-DOS[12] also include an implementation of the md and mkdir commands.

The version of mkdir bundled in GNU coreutils was written by David MacKenzie.

On Unix and Windows (with Command extensions enabled,[15] the default[16]), multiple directories can be specified, and mkdir will try to create all of them.

And an even more powerful command, creating a full tree at once (this however is a Shell extension, nothing mkdir does itself): If one is using variables with mkdir in a bash script, POSIX `special' built-in command 'eval' would serve its purpose.