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post_install(){ groupadd -f visdom chown -R :visdom /usr/lib/python2.7/site-packages/visdom chmod -R g+w /usr/lib/python2.7/site-packages/visdom echo -e "Add yourself into visdom group" } post_remove(){ if ! [ -d /usr/lib/python3.7/site-packages/visdom ] ; then groupdel visdom ; fi }