linux中jps时报错，command not found

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需要安装openjdk-devel包 
[root@namenode ~]# yum install java-1.8.0-openjdk-devel.x86_64 
[root@namenode ~]# which jps /usr/bin/jps 
[root@namenode ~]# jps 12995 Jps 10985 ResourceManager 11179 NodeManager 10061 NameNode 10301 DataNode 10655 SecondaryNameNode