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Change the effective user id and group id to that of USER.
[neo@development ~]$ su - root
[neo@development ~]$ su root -c "rm -rf linux/"
su - www -c "/srv/apache-tomcat-www/bin/startup.sh" su - www -c "/srv/apache-tomcat-m/bin/startup.sh" su - www -c "/srv/java/bin/java -jar /www/netkiller.cn/api.netkiller.cn/api.netkiller.cn-0.0.2-SNAPSHOT.jar &"