Shell

This is a simple shell written in C. It supports redirection of input and output, piping, and basic job control such as bringing the most recent background process to the foreground and continuing the most recently stopped background process.

Dependencies

GCC and Make are used to compile the shell:

apt-get install build-essential

Build

To compile:

make

To delete the compilation files:

make clean

Start the shell:

./shell

Examples

Redirection

Redirect information about your cpu into the standard input of cat and write it to a local file cpuinfo

$ cat < /proc/cpuinfo > cpuinfo
$ cat cpuinfo

Piping

This shell supports two stage piping. For example, to search for shell amongst your running processes:

$ ps -cx | grep shell

Job Control

Start a job in the background

$ sleep 10 &

Bring background job to the foreground

$ sleep 100 &
Running: sleep 100 
$ fg

Continue a job in the background

$ sleep 10
^Z
Stopped: sleep 10
$ bg
Running: sleep 10