ECHO NO ECHO
The ECHO command enables echo mode. In this mode, the translation of each
command (whether read from the keyboard or from a procedure) is echoed to the
screen whenever the translated command differs in any way from the original
command (because symbols have been translated, queries have been interpreted,
extra spaces have been removed, and so on).
The echoed command is enclosed in parentheses and written prefixed by three semicolons (;;;) for the first line of the echoed command. Subsequent lines are prefixed by a semicolon and two plus signs (;++) Echoed commands are not written to the journal file.
The NO ECHO command disables echo mode. The program starts up with echo mode disabled;
You can determine whether or not echoing is enabled by entering the SHOW ENVIRONMENT command.
The following example illustrates the use of the ECHO command.
PERCY > DEFINE OCC OCCULTATION;
PERCY > ECHO;
Percy> FIND IO_ECL OCCULTATION OF IO BY JUPITER FROM EARTH
STEP SIZE 30 MINUTES;
;;; FIND IO_ECL OCCULTATION OF IO BY JUPITER FROM EARTH
;++ STEP SIZE 1.8E+03