1:
cat lorem.txt | head -n 5 | sort

2:
wc -l lorem.txt > stat.txt

3:
ls -l /etc | head -n 14 | tail -n 10

4:
ls -l /usr | cut -c 1-10,47-100

5:
cat lorem.txt | uniq > mentes.txt

6:
cat > 1.txt

7:
ln ./os/1.txt link

8:
chmod gu+x lorem.txt