As beautiful as a shell
| Program name | minishell |
|---|---|
| Turn in files | Makefile, *.h, *.c |
| Makefile | NAME, all, clean, fclean, re |
| Arguments | |
| External functs. | readline, rl_clear_history, rl_on_new_line, rl_replace_line, rl_redisplay, add_history, printf, malloc, free, write, access, open, read, close, fork, wait, waitpid, wait3, wait4, signal, sigaction, sigemptyset, sigaddset, kill, exit, getcwd, chdir, stat, lstat, fstat, unlink, execve, dup, dup2, pipe, opendir, readdir, closedir, strerror, perror, isatty, ttyname, ttyslot, ioctl, getenv, tcsetattr, tcgetattr, tgetent, tgetflag, tgetnum, tgetstr, tgoto, tputs |
| Libft authorized | Yes |
| Description | Write a shell |
Your shell should:
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Display a prompt when waiting for a new command.
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Have a working history.
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Search and launch the right executable (based on the PATH variable or using a relative or an absolute path).
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Not use more than one global variable. Think about it. You will have to explain its purpose.
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Not interpret unclosed quotes or special characters which are not required by the subject such as \ (backslash) or ; (semicolon).
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Handle ’ (single quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence
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Handle " (double quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence except for $ (dollar sign).
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Implement redirections:
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< should redirect input.
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> should redirect output.
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<< should be given a delimiter, then read the input until a line containing the delimiter is seen. However, it doesn’t have to update the history!
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>> should redirect output in append mode
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Implement pipes (| character). The output of each command in the pipeline is connected to the input of the next command via a pipe.
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Handle environment variables ($ followed by a sequence of characters) which should expand to their values.
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Handle $? which should expand to the exit status of the most recently executed foreground pipeline.
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Handle ctrl-C, ctrl-D and ctrl-\ which should behave like in bash.
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In interactive mode:
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ctrl-C displays a new prompt on a new line.
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ctrl-D exits the shell.
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ctrl-\ does nothing.
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Your shell must implement the following builtins:
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echo with option -n
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cd with only a relative or absolute path
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pwd with no options
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export with no options
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unset with no options
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env with no options or arguments
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exit with no options
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