crash, the shell that hopefully doesn't crash

compilation instructions

1. simply type make
2. run with ./crash

todo

• assign prompt if passed in
• leave default if not
• print error if flag is used, but with no prompt
• accept user input
• parse commands and flags
• program commands (using execvp())
• notify user if command is not found
• print pid of command when spawned, including name of command
• wait for child to exit by default
• when a child process exits, print out the pid and exit status // possible segfault
• backgrounding tasks
• exit
• pid
• ppid
• cd
• cd <dir>
• pwd

extra credit

• jobs command

things i added (or want to add) not in the spec

• get env vars
• set env vars
• file redirects
• pipes