clark@web ~ %
 ls
contact.txt   
experience
   github.txt
clark@web ~ %
 ls -l experience
total 
-rw-r--r--  1 clark  staff  Dec 13 2021 jump
-rw-r--r--  1 clark  staff  1571 Sep  1 2016 yale
clark@web ~ %
 cat contact.txt
me [at] clarkxie.com
clark@web ~ %