先前以為是使用者許可權問題，切換至root使用者還是同樣問題，
結果發現沒有安裝xclock的rpm
就是這個rpm xorg-x11-apps
rmp -ivh xorg-x11-apps-7.7-6.el7.x86_64.rpm 安裝了xclock就沒問題了
RHEL7 解決xclock的 bash: xclock: command not found…
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