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linux下显示dd命令的进度

linux下显示dd命令的进度:
dd if=/dev/zero of=/tmp/zero.img bs=10M count=100000
想要查看上面的dd命令的执行进度,可以使用下面几种方法:
比如:每5秒输出dd的进度
方法一:
watch -n 5 pkill -USR1 ^dd$
方法二:
watch -n 5 killall -USR1 dd
方法三:
while killall -USR1 dd; do sleep 5; done
方法四:
while (ps auxww |grep " dd " |grep -v grep |awk '{print $2}' |while read pid; do kill -USR1 $pid; done) ; do sleep 5; done
上述四种方法中使用三个命令:pkill、killall、kill向dd命令发送SIGUSR1信息,dd命令进程接收到信号之后就打印出自己当前的进度。

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