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Certain Linux platforms either include CouchDB or provide a package as part of its native package management system.
On Ubuntu and Debian you can use:
sudo aptitude install couchdb
On Gentoo Linux there is a CouchDB ebuild available:
sudo emerge couchdb
In all cases, the installation should install and automatically start CouchDB for you. If not, you can always start or stop using the init scripts. For example:
/etc/init.d/couchdb start