Commodore PC - Page 183

Batch Processing 111
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You must use two percent signs {%% ) so that one will remain
after the batch parameter (%0-%9) processing is complete. If
you had only %/, instead of % %/, then the batch parameter pro
cessor would see the %, look at/, decide that %/was an error
(a bad parameter reference), and throw out the %/so that the
^«*. for command would never see it.
If the for command is not in a batch file, you should use only one
percent sign.
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