/usr/share/vim/vim80/ftplugin/btm.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
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 | " Vim filetype plugin file
" Language: BTM
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2004 Jul 06
" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
finish
endif
" Behaves just like dosbatch
runtime! ftplugin/dosbatch.vim ftplugin/dosbatch_*.vim ftplugin/dosbatch/*.vim
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