linux确认进程运行环境是否为ssh远程连接

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check if this command coming from sshd.

process

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cat /proc/$PPID/status | head -1 | cut -f2

SSH environment variable

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echo $SSH_CLIENT
echo $SSH_CONNECTION
# ubuntu desktop: they are not existed

who am i

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who am i

graphic environ

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echo $DISPLAY
# ssh : None
# ubuntu desktop: ":0"