A simple Linux shell written in C.
command [arg1 arg2 ...] [< input_file] [> output_file] [&]…where items in square brackets are optional.
- Blank lines and comments (lines beginning with
#) are ignored $$is expanded to the process ID of the shell- Input and output redirection with
<and> - Commands ending with
&are run in the background (unless in foreground-only mode)
Note: All other commands are run as child processes of the shell.
Changes the working directory. Takes an optional absolute or relative path to change to. When called with no arguments, it changes to the directory specified by the HOME environment variable.
Kills child processes or jobs started by the shell before terminating itself.
Prints either the exit status or the terminating signal of the last foreground process run by your shell.
Ignored by all processes except background children, which will terminate themselves upon receipt of the signal.
Only handled by the parent process, which will toggle foreground-only mode on and off.