mkdir -p

To create the hierarchy of directory we can use the mkdir command with the -p option. For eg. check the below mentioned directory structure we have three different level of directories.

os
|-- linux
|     |-- debian
|     |-- fedora
|     `-- ubuntu
`-- unix
      |-- aix
      |-- bsd
      `-- mac

The command to create the above mentioned directory structure as follows.

$ mkdir -p os/{linux/{debian,fedora,ubuntu},unix/{aix,bsd,mac}}