Not gibberish. It’s all explained there: https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html https://www.gnu.org/software/bash/man

Not gibberish. It’s all explained there: https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html https://www.gnu.org/software/bash/manual/html_node/Shell-Par... If you’re doing stuff with something, why not read the manual os that thing? Or, at least, the section related to what you’re doing?