Create aliases - words that are replaced by a command string. Aliases expire with the current shell session unless defined in the shell’s configuration file, e.g.
~/.bashrc. More information: https://tldp.org/LDP/abs/html/aliases.html.
alias
alias word="command"
alias word
unalias word
rm into an interactive command:alias rm="rm --interactive"
la as a shortcut for ls --all:alias la="ls --all"