Command Line Editing

The text in the User Command Area and the various transient prompter windows can be edited using the following set of commands:
CTRL-A  move to start of line  
CTRL-B  move one position back  
CTRL-D  forward delete one character  
CTRL-E  move to end of line  
CTRL-F  move one position forward  
CTRL-H  backward delete one character  
CTRL-K  forward delete rest of line  
CTRL-U  delete complete line  
DEL     backward delete one character
On most keyboards, a left-arrow can be used instead of CTRL-B, and a right-arrow instead of CTRL-F.
Hermes GIPSY