実演例

yes
yes | tail
yes "" | nl -ba | tail -n +100 | head -15
yes "" | nl -ba|grep '3'
yes "" | nl -ba|grep '3'|head
yes "" | nl -ba|grep '3'|head -20
yes "" | nl -ba|grep '3$'
yes "" | nl -ba|egrep '3$'
yes "" | nl -ba|head | grep '3$'
yes "" | nl -ba|head | grep '3 $'
yes "" | nl -ba|head | od -x
yes "" | nl -ba|head | grep '3.$'
yes "" | nl -ba| grep '3.$'
ls
ls | cat
ls | tac
ls | tac |tac
ls | tac |tac|tac
ls | tac |tac|tac|tac
ls | tac |tac|tac|tac|tac
ls | rev
ls | cat|rev
ls | rev|rev
ls | rev|rev|rev
ls | rev|rev|rev|rev
ls -l
ls -l |awk '{print $9}'
ls -l |awk '{print $1}'
ls -l |awk '{print $1,$3}'
ls -l | cut -d' ' -f9
ls -l
ls -l | grep '^d'
ls -l | grep '^-'
ls -l | grep '-'