When you run xterm the error appears as follows.
xterm Xt error: Can’t open display:
xterm: DISPLAY is not set
My system centos6.2
Solution.
1, first make sure you have x11 installed: yum -y install xorg-x11-xauth
2. Second, modify the configuration file: xorg-x11-xauth/etc/ssh/sshd_config，
AllowTcpForwarding yes
X11Forwarding yes
ForwardX11 yes or（ForwardX11Trusted）
3.restart
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