If you play around enough with man pages, you may notice that a lot of shell builtin commands do not have a man page. For instance, there is no man page for the cd or the exit commands:
elliot@ubuntu-linux:~$ type cd
cd is a shell builtin
elliot@ubuntu-linux:~$ man cd
No manual entry for cd
elliot@ubuntu-linux:~$ type exit
exit is a shell builtin
elliot@ubuntu-linux:~$ man exit
No manual entry for exit
That's because shell builtin commands do not have man pages, but do not freak out just yet! You can still find help on how to use shell builtins by using the help command. For example, to get help on how to use the exit command, you can run:
elliot@ubuntu-linux:~$ help exit
exit: exit [n]
Exit the shell.
Exits the shell with a status of N. If N is omitted, the exit status
is that of the last command executed.
Similarly, to get help on how to use the cd command, you can run the help cd command:
elliot@ubuntu-linux:~$ help cd...
