diff --git a/160804105/exercise.cpp b/160804105/exercise.cpp
new file mode 100644
index 0000000..9f171d2
--- /dev/null
+++ b/160804105/exercise.cpp
@@ -0,0 +1,56 @@
+一、
+1:  
+$ vim message.txt
+2:
+  修改home不可修改权限
+  1.sudo vim /etc/auto_master
+  2.注释掉  #/home
+  3.sudo automount
+  4.sudo mkdir /home/test
+  5. sudo cp message.txt /home/test/
+3:
+sudo find /home -name "message.txt" -delete  
+二、
+1：
+sudo mkdir /home/workbench
+2：
+sudo vim /home/workbench/readme.txt
+3：
+打开vim插入三行分别是1，2，3
+4：
+ cat -n readme.txt
+显示
+     1	1
+     2	2
+     3	3
+5：
+  sudo su 进入sh-3.2#
+  sh-3.2# ls /home >> /home/workbench/list.txt
+6：
+  sh-3.2# wc -m /home/workbench/list.txt
+三、
+1：
+  man ls
+ 2：
+  sh-3.2# apropos calenda
+  CalendarAgent(8)         - calendar data process
+  Date::Calc(3pm)          - Gregorian calendar date calculations
+  Date::Calendar(3pm)      - Calendar objects for different holiday schemes
+  Date::Calendar::Profiles(3pm) - Some sample profiles for Date::Calendar and Date::Calendar::Year
+  Date::Calendar::Year(3pm) - Implements embedded "year" objects for Date::Calendar
+  cal(1), ncal(1)          - displays a calendar and the date of Easter
+  calendar(1)              - reminder service
+  iwidgets_calendar(n), iwidgets::calendar(n) - Create and manipulate a monthly calendar
+  widget_calendar(n)       - widget::calendar Megawidget
+四、
+1：
+  创建/Users/jijiaming/Desktop/test 文件夹，里面有若干.png .txt .docx 文件
+  sh-3.2# find /Users/jijiaming/Desktop/test -name "*.png"
+2：
+  sh-3.2# find /Users/jijiaming/Desktop/test -name "*hiking*" –delete
+3:
+  sh-3.2# mkdir science
+  sh-3.2# tar czvf data.tar.gz *.txt
+  sh-3.2# tar cf pic.tar.gz *.png
+  sh-3.2# tar xzvf pict.tar.gz -C science/
+  sh-3.2# tar xzvf data.tar.gz -C science/