shell_init.c 28 interactive shell settings
               main.c 88 start of shell JOBC is ON
               main.c 64 [ls] stack=[0] state=[4]
        token_print.c 29 13:[ls]
               main.c 64 [ls] stack=[0] state=[4]
        token_print.c 29 13:[ls]
               main.c 64 [ls] stack=[0] state=[4]
        token_print.c 29 13:[ls]
               main.c 64 [ls] stack=[0] state=[4]
        token_print.c 29 13:[ls]
               main.c 64 [ls] stack=[0] state=[4]
        token_print.c 29 13:[ls]
               main.c 64 [env] stack=[0] state=[4]
        token_print.c 29 13:[env]
         shell_exit.c 17 shell_exit()