alias: alias [-p] [name[=value] ... ]
Define or display aliases.
Without arguments, `alias' prints the list of aliases in the reusable form `alias NAME=VALUE' on standard output.
Otherwise, an alias is defined for each NAME whose VALUE is given. A trailing space in VALUE causes the next word to be checked for alias substitution when the alias is expanded.
Exit Status:
alias returns true unless a NAME is supplied for which no alias has been
defined.