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post_install () { grep -qe '^/bin/imrsh$' etc/shells || echo '/bin/imrsh' >> etc/shells grep -qe '^/usr/bin/imrsh$' etc/shells || echo '/usr/bin/imrsh' >> etc/shells } post_upgrade () { post_install "$@" } pre_remove () { sed -i -r '/^(\/usr)?\/bin\/imrsh$/d' etc/shells }