Normally,
you??™d add tasks that the batch file should perform based on the user??™s selection. Notice that the
copy and display selections tell the batch file to go back to the Repeat label. This is the most common
technique for creating a menu loop in a batch file. The batch file ends by telling the user goodbye
and turning echo back on.
Using the Echo Command
The command line uses the term echo to describe the process where the system echoes (repeats)
every command in a batch file to the command line. Echo provides a means of seeing which command
the system is processing. However, echo can become confusing for users who aren??™t aware
of or don??™t care about the commands that are executing. In addition, echo can disrupt visual effects,
such as menu systems, that you create. The Echo command has two forms. The first form
ECHO [{ON | OFF}]
displays the echo status when you don??™t include any arguments. The ON argument turns on echo so
you can see the commands, and the OFF argument turns off echo so you can create visual effects.
You can precede the Echo command with the @ sign so it doesn??™t appear as one of the commands.
@Echo OFF would turn echo off without displaying the echo command at the command prompt.
Pages:
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375