Type in the following commands and have a good time: !! | !! echo “He says:\”Hello World!\”” and stranger: echo “He says:\”Hello World\!\”” echo !! echo !!!! echo “He says:\”Hello World!\”” And another one: echo “;expr 1 + 1;echo ” echo “!!” expr 1 + 1 can be any command (like wget, sftp, reboot …) […]