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post_install() { ln -sv /opt/tempo/bin/tempo /usr/bin/tempo echo "Please run: echo 'export \"TEMPO=/opt/tempo\"' >> ~/.bashrc" } pre_upgrade() { rm -f /usr/bin/tempo } post_upgrade() { post_install } pre_remove() { pre_upgrade } post_remove() { echo "Remove \$TEMPO from your ~/.bashrc." }