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<div class="moz-cite-prefix">On 20/12/2021 15:06, Don Hosek wrote:</div>
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It’s the duplication of names. This is an old problem: TeX and friends effectively have their files living in a flat namespace¹ so every TeX file in TeX live needs to be uniquely named and similarly every MF file needs to be uniquely named.
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<div class="">1. It’s worth noting that at the time of TeX’s creation and well into the 80s some common operating systems did not even have a mechanism for subdirectories of any kind. PC-DOS first gained subdirectories with version 2.0 in 1983 and VM/CMS never
supported them (files were kept in virtual disks and the OS would respond to a request for U MF by starting with disk A (the user disk) and going through all the disks in alphabetical order up to Z until it found the file).</div>
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<p>Wow ! Thank you Don.<br>
-- <br>
<i>Philip Taylor</i><br>
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