/usr/share/lyx/kbd/portuges.kmap is in lyx-common 2.2.3-5.
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 | #
# portuges.kmap
#
# blame me, jcardoso@inescn.pt, not lyx
#
\kmod ´ acute aeiouAEIOU
\kmod ` grave aA
\kmod ~ tilde aoAO
\kmod ^ circumflex eaoEAO
\kxmod acute i í
# \kxmod acute ´ ´
# \kxmod grave ` "$\\grave{}$" # is this really needed?!
# \kxmod tilde ~ ~
# \kxmod circumflex ^ ^
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