The method for command line editing depends upon the value to which the environment variables EDITOR and/or VISUAL are set . ... To use the editing commands provided by the EMACS editor you would add the following line to your .profile file. ... Command line editing can also be turned on by using a shell command to set an option to one of the above values. ... If emacs or gmacs is set, command line editing is in the style of the EMACS editor; if vi is set editing is in the style of the vi editor. ...