Do you know where can I find all commands like dig, mount, grep, cat, etc. All those built-into bash and Ubuntu Linux?
I appear to be interpreting your question differently from the other posters; I feel like you're trying to get a comprehensive list of programs that can be run from the shell.
I'm going to start by saying, the bash built-in commands can be found through the bash help system. This is distinct from the programs shipped with ubuntu like sed, awk, grep, etc.
Having said that, this list is almost certainly going to be useless, because of the sheer volume of commands (hundreds and hundreds and hundreds).
And THAT being said, there are a few ways to do this. You can do an
Or, at the bash prompt, you could just hit
will show you the bash's manual, where you'll find a list of all the bash commands too.
All the other commands (not just the command line ones, though, KDE/Gnome GUI programs are there too) usually are in
so for example
If you're looking for a specific command you can use
You'll get a list of all the man entries that have something to do with audio and are installed on your system.