Some interesting software tool notes under Ubuntu

1. sudo !!Execute the above command with administrator privileges
2. :w !sudo tee %Save editing file without permission in Vim
3. htop, iotopview process, memory and IO load
4. historyView command history
5. tmuxwindow management tool
6. systemd-analyzeSee the boot speed on a system using systemd
7. fortuneThis command will randomly output funny words, such as famous quotes or jokes. The Chinese version is fortun-zh
8. cmatrixOutput endless strings from top to bottom, similar to the matrix effect in <<The Matrix>>.
9. toiletOutput WordArt composed of ASCII codes.
10. calPrint the calendar for March 2018: cal 3 2018
11. lolcatMake characters colored: ls | lolcat