#The following use of the argument -k will show all available versions of the commmand
#You wish to read the manual about.
$man -k [command-to-look-up]

#Some commands have more than one manual page, one can be for syntax using the command
#while the other can be a manual about how to configure the config file for that command.
#Yon can select the one you want you add the number of the manual before the command you
#wish to read about like this:
$man 1 bash