postinst is in xubuntu-icon-theme 18.04.5.
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 | #!/bin/sh
set -e
# Install icon caches for the included icon themes
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
if which update-icon-caches >/dev/null 2>&1 ; then
update-icon-caches /usr/share/icons/elementary-xfce /usr/share/icons/elementary-xfce-dark /usr/share/icons/elementary-xfce-darker /usr/share/icons/elementary-xfce-darkest
fi
fi
exit 0
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