New Yet Shell: a main command-line interface between a user and the operating system
This is a command-line interpreter. It works as follows:
- It prompts you to enter a command.
- It interprets the command you entered.
- If you entered a built-in command (cd, exit, fg, jobs), then the shell runs that command.
- If you entered an external program (e.g., /bin/ls), or multiple programs connected through pipes (e.g., ls -l | less), then the shell creates child processes, executes these programs, and waits for all these processes to either terminate or be suspended.
- If you entered something wrong, then the shell prints an error message.
- Rinse and repeat until you press Ctrl-D to close STDIN or enter the built-in command exit, at which point the shell exits.
- handle signals and I/O redirection
- Linux programming environment and the shell.
- processes created, destroyed, and managed.
- OS and system calls.
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