Follow instructions on Jenkins wiki section 1.2 "By hand".
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download jenkins.war;
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Search for the plugin, find if it has any dependency plugin. For example, plugin checkstyle depends on analysis-core stated in "Dependencies" section;
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Download hpi files in Download Site;
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Copy hpi files downloaded to $HOME/.jenkins/plugins folder and restart Jenkins:
nohup java -jar jenkins.war 1>jenkins.log 2>jenkins.log &
Verify: Jenkins Dashboard(http://localhost:8080) -> Manage Jenkins -> Manage Plugins -> Installed: