#1
mkdir -p ~/atelier/seria_1 ~/atelier/seria_2
#2
ls -a -g ~/atelier
tree ~/atelier
#3
ls -a -g ~/
du -m ~/
#4
cp /etc/passwd ./plik_pass
#5
mv ./plik_pass password
#6
mv ./password ~/atelier/seria_1
#9
touch document
ls -g document
file document
#10
du -m ~/
#11
ls -g /home | grep raven
#12
diff ~/atelier/seria_1 ~/atelier/seria_2
#13
mkdir examples
tree ~/ > ./examples/tree.txt
#14
cal -y 1997
#15
cal 9 1767
#17
man touch
#18
< /etc/passwd