You really can't .. commands may be scattered all over the system. They aren't in one exact place.
However, a good place to start would be with the 'bin' directories - /bin, /usr/local/bin, /usr/sbin, etc.
A listing of DOS commands are available if you type help at the command prompt. DOS commands do vary from version to version.
A list of SQLplus commands is available on the Docs Oracle website. This website contains a summary table that briefly describes and lists SQLplus commands.
One of the most popular admin commands script is "Person229's admin commands". You can find these commands on the free models. There are also numerous other VIP command scripts available on the free models which you can use.
There is none. For starters, you have it backwards, DOS actually copied most of its commands from Unix (The rest came from CP/M.), which Linux is inspired by. Commands like "cd" and "dir" were Unix commands long before DOS even existed.
One popular admin commands script is Person229's admin commands. You can find these commands on the free models. There are also numerous other VIP command scripts available on the free models which you can use.
Typing help will give you a list of all commands available.
Type HELP for a complete list of available commands.
no
Each server as its own set of commands. There is not a list of all commands available as they are different from server to server. If you want to know the commands you can use on a single player world, just use /help you the list.
Type help in cmd.exe
MENU
To list the user EXEC commands, you can use the command ? or help in the command-line interface of a Cisco device. Simply enter either of these commands at the user EXEC prompt, and a list of available commands will be displayed. This is useful for quickly identifying the commands you can use in that mode.