When working on the command-line, it’s often useful to paste from the system clipboard to a command-line tool, or to copy output from the command-line into your system clipboard.

On macOS, pbcopy and pbpaste do this. On Linux, you can use xclip or xsel.

Bash/Zsh curly-brace expansion is simple but powerful: each permutation enclosed in braces is expanded, recursively, before glob expansion: