Bash script that checks attendance of logged in users on Ubuntu.

All files have to be placed in the same directory as the bash script itself.

1. Create students.txt that contains information about the date when a student should be logged in:
   user name day initial hour end hour

• day in format: Mon, Tue, Wed, Thu, Fri, Sat, Sun
• initial hour and end hour in format XX:XX

2. Create an empty register.txt
3. Create an empty t_register.txt
4. Type in terminal sudo apt-get install moreutils
5. Set automatic execution of the script

• crontab -e
• * 1 * * * /home/<user>/Desktop/attendance.sh (in case of having files on Desktop) Condition for the automatic execution to work:
• chmod +x <cd and name> - changes permission by adding "x" to let crontab execute the script
  In order to have an attendance fully checked, the script needs to be run two times. Therefore, please adjust students' hours to crontab settings so that their attendance is checked twice.

The first time the attendance is checked, the information is put into t_register.txt.
If the user is still logged in during the second execution of the bash script, the attendance is removed from t_register.txt and goes to a permanent register.txt.
If the user is logged in only during one check, the permanent attendance is not registered.