In WAVE's menu file, the variables listed below are interpreted by WAVE before they are passed to the shell, typically as command-line arguments in button-action commands.
| $RECORD | the current record name |
| $ANNOTATOR | the current input annotator name |
| $START | the current Start (elapsed) time as shown in the Analyze window (the time of the `<' marker, if any) |
| $END | the current End (elapsed) time as shown in the Analyze window (the time of the `>' marker, if any) |
| $DURATION | the time interval between $END and $START |
| $LEFT | the time of the left edge of the signal window |
| $RIGHT | the time of the right edge of the signal window |
| $WIDTH | the time interval between $RIGHT and $LEFT |
| $SIGNAL | the number of the selected signal |
| $SIGNALS | the signal list |
| $LOG | the name of the current log file |
| $DB | the DB path (from the Load window) |
| $DBCAL | the DB calibration file (from the Load window) |
| $TSCALE | the time scale, in mm/sec |
| $VSCALE | the amplitude scale, in mm/mV |
| $DISPMODE | the annotation display mode (0: annotations displayed in center, no marker bars; 1: annotations displayed in center, long marker bars; 2: annotations attached to signals, no bars; 3: annotations attached to signals, short bars; 4: annotations displayed as a signal, no bars; 5: annotations displayed as a signal, long bars) |
| $PSPRINT | the command for printing PostScript data from the standard input, as specified in the Print setup window |
| $TEXTPRINT | the command for printing text from the standard input, as specified in the Print setup window |
| $URL | the URL specified by the most recently selected link |
Other strings that begin with `$' are passed to the shell unchanged.