LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 6.9. Check For Nonprintable File

Options used:

- check_for_nonprintable FLAG lpr checks for non-printable file

- ml=minimum number of printable characters

By default lpr does not check files for for non-printable characters (i.e., escape characters) at the start of the print file. You can set the check_for_nonprintable flag to cause it to do so. The :ml value specifies the number of characters that are to be checked. Clearly, if it is 0, none will be checked.

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