Bash shell implementation that allows interactive and batch file input from a user.

To compile the program automatically, execute:

$ make

To compile the program manually, execute:

$ gcc -std=c99 -Wall -o shell main.c

To run the program, execute:

$ ./shell [batchFile]

• batchFile: an optional argument (indicated by square brackets as above). If present, the shell will read each line of the batchFile for commands to be executed and will exit when it reaches a quit command, the end of the file, or if you enter 'Ctrl-D'. If not present, the shell will run in interactive mode by printing a prompt to the user at stdout and reading the command stdin.

For example, if you run the program as:

$ ./shell /home/mat0299/csce3600/batchFile

then the shell will read commands from /home/mat0299/csce3600/batchFile until it sees the quit command, it reaches the end of file, or you type 'Ctrl-D'/'Ctrl-C'.

Alternatively, if you run the program as:

$ ./shell

then the shell will display an interactive prompt:

$ ./shell
-----[ INTERACTIVE MODE ]-----
--> Type "help" to view commands

prompt> 

This interactive shell will accept commands and display output until you quit the program.

To view a list of internal commands, type help:

$ prompt> help
/--------[ HELP: LIST OF INTERNAL COMMANDS ]-------\
| history       - prints list of commands entered  |
| prompt        - sets custom prompt string        |
| customize     - sets customized shell options    |
| path          - sets PATH directory              |
| cd            - change current directory         |
| quit OR exit  - exits shell program              |
\--------------------------------------------------/

You may execute multiple commands in interactive mode or in batch files by separating them with a ";". Such as:

prompt> ls -l; who; ps

which would output something similar to this:

Commands are run simultaneously, which means that some of the output may be intermixed. This is by design.

To exit the shell, simply type quit. This will cause the shell to stop processing any more commands and will exit.

To remove executable and object files, execute:

$ make clean

View current issues.

Alex McCulloch, Edgar Sanchez, Luis Chaparro, and Russell Price