---

echo "Информация о системе" > system_info.txt
hostname >> system_info.txt
whoami >> system_info.txt
uname -r >> system_info.txt
date >> system_info.txt
uptime >> system_info.txt
free -h >> system_info.txt
df -h >> system_info.txt
ip addr >> system_info.txt
cat system_info.txt


echo "admin" > users_data.txt
echo "student" >> users_data.txt
echo "root" >> users_data.txt
echo "user" >> users_data.txt
echo "student2" >> users_data.txt
echo "administrator" >> users_data.txt
echo "student3" >> users_data.txt

cat users_data.txt                                  
cat users_data.txt | grep student                   
cat users_data.txt | grep student | wc -l         
cat users_data.txt | grep student | sort       
cat users_data.txt | grep student | sort > students.txt
cat students.txt