After lecture 1, your instructor returned to his office and typed
"history > lec1hist" into the shell we used in class.  He then opened
lec1hist in the emacs editor, deleted the first several lines (which
corresponded to uninteresting things he typed before class).  Then he
wrote this paragraph, saved the file, and put the result on the
website.  history is a special "builtin" for the shell; I encourage
you to learn more about it.
    20	14:34	ls
    21	14:34	cd
    22	14:47	pwd
    23	15:03	clear
    24	15:05	pwd
    25	15:06	cd /
    26	15:06	pwd
    27	15:06	ls
    28	15:07	ls -F
    29	15:07	cd /home
    30	15:07	ls
    31	15:08	cd /
    32	15:08	cd /home/djg/atomcaml/
    33	15:08	cd /
    34	15:08	cd home
    35	15:08	pwd
    36	15:09	cd djg/atomcaml/
    37	15:09	pwd
    38	15:09	cd
    39	15:09	pwd
    40	15:09	man cd
    41	15:10	cd --help
    42	15:14	mkdir play
    43	15:14	cd play
    44	15:14	ls
    45	15:14	echo "hello class, my name is Dan Grosman"
    46	15:14	clear
    47	15:14	echo "hello class, my name is Dan Grosman" > myfirstfile
    48	15:15	ls
    49	15:15	ls -F
    50	15:15	cat myfirstfile
    51	15:15	cp myfirstfile mysecondfile
    52	15:15	ls
    53	15:15	cat mysecondfile
    54	15:15	cat myfirstfile
    55	15:16	diff myfirstfile mysecondfile
    56	15:16	cp myfirstfile foo
    57	15:16	rm myfirstfile
    58	15:17	rm -i foo
    59	17:13	mv msecondfile mythirdfile
    60	17:13	history > lec1hist