├OMMAND: ┼╪┼├ ╙EE ALSO: *, >, >>, ╟┼╘, ╨╒╘, ╔╬╘20, ┬┴╘├╚ ╞╔╠┼╙ ╙YNTAX: EXEC SEQUENTIAL_FILENAME ╞UNCTION: ╫HEN YOU FIRST BOOT THE ─╧╙ SHELL, IT SEARCHES DRIVE A: FOR A ╙┼╤ FILECALLED "AUTOEXEC" AND THEN PROCEEDS TO EXECUTE WHATEVER IS IN THAT FILE ASIF YOU HAD ENTERED THAT TEXT FROM THE KEYBOARD. ╘HE REASON IT DOES THIS ISBECAUSE "EXEC AUTOEXEC" IS ON THE COMMAND LINE WHEN THE SHELL IS INSTALLED. ╔F YOU'VE EVER USED ╙┘╙╥┼╙ IN 64 MODE, THEN YOU ARE PROBABLY QUITEFAMILIAR WITH ┼╪┼├ FILES AND KNOW HOW USEFUL THEY CAN BE. ╫HEN YOU ┼╪┼├ A FILE, THIS IS WHAT HAPPENS. ╞IRST, THE SHELL TRIES TO OPEN THE FILE. ╔F IT DOESN'T EXIST OR A DISKERROR OCCURS, THEN NOTHING HAPPENS. ╠IFE GOES ON AS IF YOU HAD NEVER TRIEDTO ┼╪┼├ THE FILE. ╔F ALL GOES WELL, THEN FROM THAT POINT ON, EVERY TIME THE COMPUTERATTEMPTS TO FETCH A CHARACTER FROM THE KEYBOARD (DEVICE NUMBER 0) IT WILLFETCH ONE FROM THE ┼╪┼├ FILE INSTEAD. ╔T DOESN'T MATTER WHETHER YOU'RE INDIRECT OR PROGRAM MODE OR WHETHER YOU USE ╔╬╨╒╘ OR ╟┼╘, IF THE ╦┼╥╬┼╠THINKS IT'S DEALING WITH THE KEYBOARD, IT'S NOT, IT'S DEALING WITH THE ┼╪┼├FILE. ╫HEN THE END OF THE ┼╪┼├ FILE IS REACHED, NORMAL KEYBOARD INPUT ISRESTORED. ┼╪┼├ TRIES TO BE AS INCONSPICUOUS AS POSSIBLE. ╘HERE ARE A FEWRESTRICTIONS. ╙INCE ┼╪┼├ HAS TO FETCH IT'S DATA FROM DISK (IT DOES SO ONESECTOR AT A TIME) IT MAY NEED TO OPEN UP A DISK FILE WHILE AN ┼╪┼├ IS INPROGRESS. ╘HIS ONLY APPLIES IF THE ┼╪┼├ FILE IS MORE THAN ONE BLOCK LONG.╙INCE ┬┴╙╔├ ONLY ALLOWS A MAXIMUM OF TEN FILES OPEN AT ANY ONE TIME,PROBLEMS WILL ARISE IF WHATEVER YOU'RE ┼╪┼├ING HAS TEN OPEN FILES. ╬OT AVERY LIKELY OCCURANCE. ┴ MORE LIKELY PROBLEM WOULD BE THE DISK DRIVE WHICHALLOWS FEWER OPEN FILES. ╘HERE ARE A COUPLE OF ╨╧╦┼S THAT YOU MAY FIND USEFUL WHEN USING ┼╪┼├. $1┬╞┴ - A ZERO HERE PAUSES ┼╪┼├, 255 RESUMES ┼╪┼├. $1┬┼┬ - NORMALLY ┼╪┼├ ECHOES EVERY CHARACTER IT FETCHES FROM THE ┼╪┼├ FILE TO THE SCREEN. ┴ ZERO HERE ENABLES ECHO, AND A 255 DISABLES ECHO.
