See the Pine Mailer for the latter use. Available commands are permanently displayed in help lines at the foot of the screen. Note that no backup copy of an existing file is kept. Use the arrow keys to move the cursor around the screen.
Various commands are available.
By default you will overwrite this file, but you may edit the filename to write a different file. The other commands available are listed below. Mark Set a mark at the current cursor position. Undel Line Undelete the last line or series of adjacent lines or marked block you deleted previously. Where is You will be prompted for a string for which you want to search the file.