Zliczanie linii, słów i znaków w pliku (polecenie wc; Word Count)

[adam@etoh ~]$ wc Twain
     17     188    1073 Twain

[adam@etoh ~]$ wc -l Twain
     17 Twain

[adam@etoh ~]$ ls | wc -w
     57

[adam@etoh ~]$ ls -a | wc -w
     77

[adam@etoh ~]$ echo "Ilosc obiektow w katalogu `ls -a | wc -w`"
Ilosc obiektow w katalogu      77