postrm is in desktop-file-utils 0.22-1ubuntu5.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
set -e
if [ "$1" = remove ]; then
for dir in /usr/share/applications /usr/local/share/applications; do
if [ -d "$dir" ]; then
rm -f "$dir/mimeinfo.cache"
if [ ! -L "$dir" ]; then
rmdir --ignore-fail-on-non-empty "$dir"
fi
fi
done
fi
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