Command Line Shell

About

The outermost layer of the operating system is called the shell. In Unix-based systems, the shell is generally a command line interface. Most Linux distributions ship with bash as the default (there are several others: csh, ksh, sh, tcsh, zsh). This program in an implementation of a Unix-based shell named sheesh (shee shell).

To compile and run:

make
./sheesh
Example 1: echo "hello world! > output.txt
Example 2: cat /etc/passwd | sort > sorted_pwd.txt 

Included Files

• shell.c: Driver for the shell program.
• shell.h: Header file containing built in functions for the shell.
• ui.c: Text-based UI functionality.
• ui.h: Header file, contains functions primarily concerned with interaction with the readline library.
• history.c: Command historyy functionality
• history.h: Header file contains functions for operating on the history circular array.
• shellper.c: Includes functions to get information about the system, hardware, running tasks, other processes, and relevant process information (count, state, PID, name, user).
• shellper.h: Header file for shellper.c.
• Makefile: included to compile and run the program.

Program Output

$ ./inspector

ui.c:107:init_ui(): Initializing UI...
ui.c:110:init_ui(): Setting locale: en_US.UTF-8
[:-)]-[0]-[kdcurrie@keaton-beacon:~/P2-kdcurrie]>

Testing

To execute the test cases, use make test. To pull in updated test cases, run make testupdate. You can also run a specific test case instead of all of them:

* Run all test cases:
make test

* Run a specific test case:
make test run=4

* Run a few specific test cases (4, 8, and 12 in this case):
make test run='4 8 12'