High-level language (source code): understandable by humans.
Machine code (written in binary (0’s and 1's)): understandable by computers.
Compilers and Interpreters: convert source code into machine code.
Compiler converts the whole source code into machine code at a once. Interpreter converts line by line.
Compiler gives the error messages after…
1. apropos:
If you don’t remember the command that you need, you can type a keyword with “apropos” about what you want to do. Then, all commands related to the keyword will be displayed.
2. man:
Display the manual page of a given command.
