This file is indexed.

/usr/share/m17n/GB_1988-80.map is in m17n-db 1.6.3-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Generated from /usr/share/i18n/charmaps/GB_1988-80.gz
0x0000-0x0023 0x0000
0x0024 0x00A5
0x0025-0x007D 0x0025
0x007E 0x203E
0x007F 0x007F