/usr/share/doc/texmf/jtex/test1.tex is in jtex-base 2.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | \hsize 20zw % ¿·Ã±°Ì zw zh
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\jendlinetype=2
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\jendlinetype=0
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\jendlinetype=1
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\asciipunct`, 1
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\jendlinetype=3 % both 1 and 2, default
\bye
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