Advanced shell script to understand and practice exercises ---

1. scripting /root/bin/createuser.sh,
achieve the following functions: using a user name as a parameter, if the user specifies parameters exists to show its presence, or add it; display information such as the user's id number added

All files 2. Analyzing the / var / directory

3. Add 10 users user1-user10, random password is 8 characters

4. scripted prompts enter the network addresses, such as 192.168.0.0 segment, determines the input host online

There are several interesting points of shell scripts

The multiplication table


6. isosceles

7. chess board

                                                        不忘初心 砥砺前行！！！