bash like shell using node.js , starts with default working directory set to user's home directory

node shell.js --> to start shell

1. cd <directory_name> - Should work same as bash shell. 2)pwd - Prints current working directory.
2. ls <directory_name> - Should work same as bash shell. Support for flags is not required.
3. <path_to_binary> - When path to a binary is provided, that binary should be spawned as a child process. The binary must receive all the arguments passed as space separated like arg1 arg2 ….
4. fg - Brings the background process with process id to foreground.
5. exit - Closes the shell.