This shell program is for the second assignment in COP4600, Fall 2021 edition.
This program was written by Kurt Wilson and Joseph Terribile

1. make a build directory, and cd into it
   • mkdir build
   • cd build
2. configure and make the project
   • cmake ..
   • make
3. run the project
   • ./assignment2

We implement both extra credit commands: repeat and dalekall

• repeat n command [args]
  • repeats a command in the background n times, passing an optional set of arguments to each task
  • prints a list of the PIDs for the new processes
  • processes run until they are killed (either by dalek, dalekall, or by another program) or end on their own
• dalekall
  • kills all spawned child processes that were started with background or repeat.
  • prints a list of the PIDs of the child processes that were stopped
• example:

# background /bin/sleep 100
Started with pid: 10207
# repeat 3 /bin/sleep 20
PIDs: 10212, 10213, 10214
# dalekall
Exterminating 4 processes: 10207 10212 10213 10214
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