Simple text editor.
nano [[+line-number],column-number] [file-name]
nano is a simple, keyboard-oriented text editor, controlled with control keys. For example, Control-O saves the current file; Control-W goes to the search menu. nano puts a two-line "shortcut bar" at the bottom of the screen, listing many of the commands available in the current context. For a complete list, Control-G gets the help screen.
nano can also use a mouse to activate functions that are on the shortcut bar, as well as position the cursor.
The +line-number,column-number option opens nano at line number line-number and column number column-number (at least one of which must be specified) instead of the default of line 1, column 1.
The file-name is the pathname of a new or existing file that you want to edit. If you do not specify a file-name you will be editing a new empty buffer. You'll be prompted for a file name when you save the edit buffer contents.
More information on the nano text editor (including a full command manual) can be found here: