When you are stuck and need help with a UNIX command the help is sometimes a few keystrokes away! Help is typically built into the commands themselves, available through online facilitate programs like man pages and info pages.
1. Using the Help biult-in command:
Many commands and applications have simple help screens that can be displayed with special command flags. This flag usually is “-h” or “–help“.
2. Using Man Pages
The best source of data for most commands is found within the manual pages. Theese are known asa man pages. To display a command’s man page you need to type man command
Example: If you want to get help with the grep command just type man grep and the man page for the grep command will be displayed.