pripojij prve tri riadky zo suboru etc/passwd do vypisu obsahu etc/group
cat /etc/passwd | head -3 | cat /etc/group -

vypise 3 az poslendy stlpec z /home/OS
ls -la | tr -s " " | cut -d " " -f3-

pocet riadkov vsetkych suborov a neviem ci aj podadresarov ci jaka matkina pica v subore ...vstupy
echo `find /home/OS/predtest/vstupy -type f -exec wc -l {} \;| tr -s " " | cut -d" " -f2 | tr "\n" "+"`0 | bc

pocet malych geciek v subore etc group
tr -cd "g" < /etc/group/ wc -c

druhy najpouzivanejsi shell na ose
cat < /etc/passwd | cut -d: -f7 | cut -d"/" -f5 | sort | uniq -c | sort | tail

: za / a / za : v subore etc/passwd
tr ":/" "/:" </etc/passwd

vymenene poradie slov
echo "rad chodim na fiit" |  tr " " "\n" | tail -r | tr "\n" " "

kolko slov sa v subore zmeni ked zmenime male pismena na velke
tr " " "\n" </home/OS/test_pz/test2/nejaky | grep -c "[a-z]"

vypise kolko krat bol prihlaseny pouzivatel podla poctu prihlaseni
last |cut -d " " -f1 | sort | grep "[0-9]\>" | uniq -c | sort -r | tr -s " " " "