Unix-Type-Shell

The bash developed is a Unix type shell developed in C language. It performs all the tasks that can be done by a normal shell.

Instructions

To use this shell run the Makefile, which genereates the executable shell.

make

followed by

./shell

to enter into this shell. Once in the shell, you can run all the commands that you ran run on a bash. Apart from that this shell also supports a host of custom user commands to interact with the shell. The user commands are :

HISTN : view the last N commands executed using this shell.
!HISTN : execute the Nth command executed on this shell.
pid : get the process id of this shell.
pid all : get the process ids of all the processes spawned from this shell.
pid current : get the process ids of all the processes spawned from this shell and currently active.
HELP : get the instructions for this shell.
STOP : exit from this shell.