这次摘录一个Mac大侠编写的脚本，这个脚本在7pm后，在没有用户使用时试图关机，如果有用户登陆则试图进入休眠模式. 管理员可以在StartupItem中加入，使之运行. 使网络环境更绿色. ~~~ 如下： #!/bin/sh # Sleep or shutdown script # tryin' to be 'green'..... # look for exception file if [ -f "/var/db/.dontSleep" ]; then exit 0 fi # if we're a laptop, exit. # No shutting down laptops (or waking them up unbidden!) IS_LAPTOP=`/usr/sbin/system_profiler SPHardwareDataType | grep "Model" | grep "Book"` if [ "$IS_LAPTOP" != "" ]; then exit 0 fi # check the time; exit if it's between 5 am and 7 pm current_hour=`/bin/date +%H` if [ $current_hour -gt 5 -a $current_hour -lt 19 ]; then exit 0 fi # now check idle time; # exit if we've been idle less than 20 minutes idleTime=`ioreg -c IOHIDSystem | perl -ane 'if (/Idle/) {$idle=int((pop @F)/1000000000); print $idle,"/n"; last}'` if [ $idleTime -lt 1200 ]; then exit 0 fi # tell Power Manager to wake us up or turn us on at 6am M-F pmset repeat wakeorpoweron MTWRF 06:00:00 # check to see if a user's logged into the console login_status=`/usr/bin/who | /usr/bin/awk '{ print $2 }'` for i in $login_status; do if [ $i = "console" ]; then # someone's logged in, sleep osascript -e 'tell application "System Events" to sleep' exit 0 fi done # if we got this far, it's OK to shut down. /sbin/shutdown -h now exit 0 ~~~