$ pwd
/c/cs2000/hws
$ mkdir mt
$ cd mt
$ pwd
/c/cs2000/hws/mt
$ echo going for the gold > skiing
$ echo stand on the podium > luge
$ cat luge
stand on the podium
$ cat luge >> skiing 
$ cat skiing 
going for the gold
stand on the podium
$ wc skiing 
 2  8 39 skiing
$ ls -l
total 0
-rw-rw-r-- 1 sbs5 cs200ta 20 Feb 19 15:08 luge
-rw-rw-r-- 1 sbs5 cs200ta 39 Feb 19 15:09 skiing
$ touch luge
$ ls -l
total 0
-rw-rw-r-- 1 sbs5 cs200ta 20 Feb 19 15:10 luge
-rw-rw-r-- 1 sbs5 cs200ta 39 Feb 19 15:09 skiing
$ ls .. > bobsled
$ ls -l
total 4
-rw-rw-r-- 1 sbs5 cs200ta 95 Feb 19 15:10 bobsled
-rw-rw-r-- 1 sbs5 cs200ta 20 Feb 19 15:10 luge
-rw-rw-r-- 1 sbs5 cs200ta 39 Feb 19 15:09 skiing
$ wc bobsled
12 12 95 bobsled
$ head -5 bobsled
hw0a.pyc
hw0.py
hw1a.pyc
hw1.py
hw2a.pyc
$ mkdir curling
$ ls -l
total 8
-rw-rw-r-- 1 sbs5 cs200ta   95 Feb 19 15:10 bobsled
drwxrwsr-x 2 sbs5 cs200ta 4096 Feb 19 15:10 curling
-rw-rw-r-- 1 sbs5 cs200ta   20 Feb 19 15:10 luge
-rw-rw-r-- 1 sbs5 cs200ta   39 Feb 19 15:09 skiing
$ rmdir curling
$ ls -l
total 4
-rw-rw-r-- 1 sbs5 cs200ta 95 Feb 19 15:10 bobsled
-rw-rw-r-- 1 sbs5 cs200ta 20 Feb 19 15:10 luge
-rw-rw-r-- 1 sbs5 cs200ta 39 Feb 19 15:09 skiing