- zsh builtins:
    . : alias autoload b bindkey break bye ch chdir clone command
    comparguments compcall compctl compdescribe compfiles compgroups
    compquote comptags comptry compvalues continue declare dirs disable
    disown echo echotc echoti emulate enable eval exec exit export
    false fc fg float functions getcap getln getopts hash history
    integer jobs kill let limit local log logout noglob popd print
    printf pushd pushln pwd r read readonly rehash return sched set
    setcap setopt shift source stat suspend test times trap true ttyctl
    type typeset ulimit umask unalias unfunction unhash unlimit unset
    unsetopt vared wait whence where which zcompile zformat zftp zle
    zmodload zparseopts zprof zpty zregexparse zsocket zstyle ztcp