M ost popular Linux/Unix command those are required to know during working on Linux/Unix environment. Primarily, when I started the work on ubuntu, I faced a common problem that was not familiar to know about the basic ubuntu command. After that, I aggregate basic commands and work very well. Besides that, most of the time forgot the command and this helps me to cut-down googling time. Privileges SL Command Use / Description 1 sudo command Run command as root 2 sudo -s Open a root shell 3 sudo -s -u user Open a shell as user 4 sudo -k Forget sudo passwords 5 gksudo command Visual sudo dialog (GNOME) 6 kdesudo command visual sudo dialog (KDE) 7 sudo visudo edit /etc/sudoers 8 gksudo nautilus root file man