A linux shell with tree like pipe mechanisms

This shell allows you to create pipes through which multiple processes can write and read. Every process can read from a single pipe while each process can write to any number of pipes.

• >| creates an output pipe and the process writes on it. Just write the command, put ">|" and write numbers that uniquely identify pipes.
• <| creates an input pipe and the process reads from it. Notice that there can be only one pipe process reads from. Just write the command, put "<|" and write numbers that uniquely identify pipes.

Whenever there is a reader and a write for each pipe in the network, all processes run.

Example Usage

  make
  ./shell
  (shell starts)

  ls /tmp >| 12 13
  ls -l /tmp >| 12
  ls -la /usr/bin >| 13
  tr /a-z/ /A-Z/ <| 17
  cut -c 1-7 <| 12 >| 17
  grep a <| 13 >| 17
  quit

• The result of ls /tmp gets written to pipes 12 and 13.

• The result of ls -l /tmp gets written to pipe 12.

• The result of ls -la /usr/bin gets written to pipe 13.

• cut -c 1-7 reads from pipe 12 and writes to pipe 17.

• grep a reads from pipe 13 and writes to pipe 17.

• tr /a-z/ /A-Z/ reads from pipe 17 and outputs to stdout.

• quit stops the shell.