/usr/share/texlive/texmf-dist/web2c/mktexdir.opt is in texlive-base 2017.20180305-1.
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1 2 3 4 5 6 7 8 9 10 11 | # mktexdir.opt to determine various manipulations of the filenames.
# Sourced from mktexdir.
#
# Originally written by Thomas Esser.
# Public domain.
# $Id: mktexdir.opt 16497 2009-12-24 18:38:47Z karl $
# Set append-only bit on created directories.
case "$MT_FEATURES" in
*appendonlydir*) MT_APPEND_MASK=+t;;
esac
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