adds a few bash scripting exersises

modules/qualifying/exercises_bashscripting.md

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+# Bash scripting exercises
+
+## Write a script that outputs interesting network information
+
+The script takes no arguments and just outputs interesting information about the network in an easy to read format.
+Output at the minimul the following information but more is better.
+
+* internal ip address
+* external ip address
+* default route 
+* the nameservers used by the machine
+* your hostname
+
+### Additional challenges
+
+* see if you can ping 8.8.8.8 and display only the time it takes
+	* can you ping the same host multiple times and calculate the average?
+	* display an error message if the destination can not be reached
+* evaluate the quality of the uplink with `speedtest-cli` and echo back some relevant information (but not all)
+
+## Write an alarm clock
+
+**TODO** (IPC exercise)
+
+## Automate adding users to your machine
+
+Write a script that can add a list of users to your system.
+Make it so that the newly created users have a default password that is the same as their username.
+You can go about this in two ways, either the command line arguments are the usernames, **or** the first command line argument supplies a text file where every line is a user.
+
+```bash
+./my_script.sh bob alice marie camille roger
+./my_script.sh /path/to/user/list.txt
+```
+
+In the second example the `/path/to/user/list.txt` file would contain the following lines.
+
+```
+bob
+alice 
+marie 
+camille 
+roger
+```
+
+### Additional challenges
+
+* display an error message when the script is executed as a **non root** user
+* add all of the new users to a specific group
+* put all of the new users $HOME directory in a distinct folder so that their home would be `/home/students/$HOME`
+* write a **second** script that removes these users from the system **and** also removes all traces of their existance
+* how could you combine both scripts into one big script?