mkdir - make a directory

Mkdir creates the specified directories.  It requires write permission in the parent directory.

       If  the  -p  flag  is  given, mkdir creates any necessary parent directories and does not complain if the
       target directory already exists.

       The -m flag sets the permissions to be used when creating the directory.  The default is 0777.

Mkdir returns null exit status if  all  directories  were  successfully  made.   Otherwise  it  prints  a
       diagnostic and returns "error" status.

                                                                                                   MKDIR(1plan9)

       mkdir - make a directory

rm(1)
       cd in rc(1)

/src/cmd/mkdir.c

mkdir [ -p ] [ -mmode ] dirname...