There is no standard 'format' command in Unix.
To get the online description of any Unix command, you can use the man command followed by the name of the command you want to learn about. For example, typing man ls will display the manual page for the ls command. Additionally, you can use the --help option with most commands (e.g., ls --help) to get a brief overview of its usage and options.
Use the 'grep' command
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There is no traditional 'execute' command in Unix.
The 'CD' command is not standard for Unix. The 'cd' command, however, will change directories (folders). It is a means of navigating the Unix file system.
In Unix, use the 'man' command.
The "who" command.
cat /proc/version The above answer will only work on certain systems. For most Unix systems, use the 'uname' command to get the Unix version. AIX uses the oslevel command.
nslookup
dig
The question is too broad to be answered in a short format for this site. I suggest you look at an operating systems textbook for a complete description.
Believe it or not, nslookup.