How can I quickly create all folders named {Single|Multi}Lane_{Single|Dual}Carriageway_{USA|Europe} In Bash or Zsh, what is the shortest way to create a folder for each possible combination of substrings? Is there maybe even a notation such as mkdir {Single|Multi}Lane_{Single|Dual}Carriageway_{USA|Europe} which should result in the creation of SingleLane_SingleCarriageway_USA MultiLane_SingleCarriageway_USA SingleLane_DualCarriageway_USA MultiLane_DualCarriageway_USA SingleLane_SingleCarriageway_Europe MultiLane_SingleCarriageway_Europe SingleLane_DualCarriageway_Europe MultiLane_DualCarriageway_Europe My substrings also may have more than two options, such as `{USA, Europe, Asia}`.

Change the `|`s in your command to `,`:


mkdir {Single,Multi}Lane_{Single,Dual}Carriageway_{USA,Europe}


3.5.1 Brace Expansion