SYNOPSIS
bash defines the following built-in commands:
:, ., [, alias, bg, bind, break, builtin, case, cd, command, compgen, complete,
continue, declare, dirs, disown, echo, enable, eval, exec, exit,
export, fc, fg, getopts, hash, help, history, if, jobs, kill,
let, local, logout, popd, printf, pushd, pwd, read, readonly, return, set,
shift, shopt, source, suspend, test, times, trap, type, typeset,
ulimit, umask, unalias, unset, until, wait, while.
BASH BUILTIN COMMANDS
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man1/bash.1