LPRng-HOWTO: 15 Oct 2001 (For LPRng-3.7.9)
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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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