Linux Sudo Command

Before the first time I have got to know the Linux Sudo command, I felt difficult to do some tasks that I could do very easily in Windows. Even if I wanted to edit a text file in my home built Linux:

When I was in a school, I can edit a text file very easily on Sun Microsystems Unix/Solaris:

pico index.html

Or

vi index.html

But I couldn't edit a text file using the same command using my home built Linux.

Until  someday someone told me the Linux sudo command. Sudo allows a permitted user to execute a command as the superuser or another user, as specified by the security policy.

For example, to edit a text with superuser privilege, add sudo to the front:

sudo pico index.html

Or

sudo gedit index.html

When a user type sudo command, Linux will prompt for sudo password for the first time and no need to input the password every time. That saves a lot of time and effort instead.

My practical method is in case of I cannot edit or delete a file because of insufficient privilege, I will add the sudo prefix.