$ make
$ ./shell

$ myshell>ps
  PID TTY           TIME CMD
 3950 ttys000    0:00.06 -bash
 5187 ttys001    0:00.00 ./shell
 
$ myshell>find . -name "*.c"
 ./builtin.c
 ./job.c
 ./list.c
 ./main.c
 ./parser.c
 ./tokenizer.c
 
$ myshell>ls | grep .c
 builtin.c
 job.c
 list.c
 main.c
 parser.c
 tokenizer.c
 
$ myshell>head -n 2 main.c > test.txt
$ myshell>cat test.txt
 #include <stdlib.h>
 #include <string.h>
 
$ myshell>sleep 100 &
$ myshell>sleep 50 &
$ myshell>jobs
 [0]: Running(background)	 sleep 100 &(5565)
 [1]: Running(background)	 sleep 50 &(5568)
$ myshell>fg 0
 ^C5565: Terminated with signal:2
 myshell>jobs
 [0]: Running(background)	 sleep 50 &(5568)
$ myshell>fg 0
 ^Zmyshell>jobs
 [0]: Stopped	 sleep 50 &(5568)
$ myshell>bg 0
$ myshell>jobs
 [0]: Running(background)	 sleep 50(5568)
$ myshell>kill 5568
 5568: Terminated with signal:15
 [0]	Completed	 sleep 50 & (pgid:5568)