1，命令模式
systemctl set-default multi-user.target
2,图形模式
systemctl set-default graphical.target
3,运行时间
cat /proc/uptime| awk -F. '{run_days=$1/86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 % 60;printf("\n系统已运行：%d天%d时%d分%d秒\n\n",run_days,run_hour,run_minute,run_second)}'
systemctl set-default multi-user.target
2,图形模式
systemctl set-default graphical.target
3,运行时间
cat /proc/uptime| awk -F. '{run_days=$1/86400;run_hour=($1 % 86400)/3600;run_minute=($1 % 3600)/60;run_second=$1 % 60;printf("\n系统已运行：%d天%d时%d分%d秒\n\n",run_days,run_hour,run_minute,run_second)}'
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