vi editor commands

vi filename.ext create the new file in the pwd.

"i"-------insert the cursor

"a"----write after cursor

"A"----write at the end of the line

:w----quit from the current file

:wq---save and quit from the current file

ESc----terminate from insert mode
:g/^$/d--------remove all empty line from the current file
shift+zz-----exit from the current file