bash help

# help
ってなにげなく打ってみたら、

GNU bash, version 4.0.28(2)-release (i686-pc-linux-gnu)
These shell commands are defined internally.  Type `help' to see this list.
Type `help name' to find out more about the function `name'.
Use `info bash' to find out more about the shell in general.
Use `man -k' or `info' to find out more about commands not in this list.

A star (*) next to a name means that the command is disabled.

 job_spec [&]                                                         history [-c] [-d offset] [n] or history -anrw [filename] or histo>
 (( expression ))                                                     if COMMANDS; then COMMANDS; [ elif COMMANDS; then COMMANDS; ]... >
 . filename [arguments]                                               jobs [-lnprs] [jobspec ...] or jobs -x command [args]
 :                                                                    kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kil>
 [ arg... ]                                                           let arg [arg ...]
 [[ expression ]]                                                     local [option] name[=value] ...

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