$ [sudo] pip install shell-cache

$ [sudo] npm i -g shell-cache

$SHELL_CACHE/<hash> # ~/.cache/shell-cache/<hash> by default

$ export SHELL_CACHE=~/.cache/shell-cache # $XDG_CACHE_HOME/shell-cache by default

$ shell-cache "key" "value ..."
$ shell-cache "key"
"value ..."