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post_install() { grep -qe '^/usr/bin/elvish$' etc/shells || echo '/usr/bin/elvish' >> etc/shells grep -qe '^/bin/elvish$' etc/shells || echo '/bin/elvish' >> etc/shells } pre_remove() { sed -ri -e '\|^/usr/bin/elvish$|d' -e '\|^/bin/elvish$|d' etc/shells }