在使用dd的时候查看进度，当接收到USR1信号，dd会输出进度信息
watch -n 10 sudo kill -USR1 $(pidof dd)
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输出结果：
woliu@woliu-sh meego-img $ sudo dd if=meego-netbook-ia32-chrome-1.0.80.10.20100709.1.img of=/dev/sdf
932779+0 records in
932779+0 records out
477582848 bytes (478 MB) copied, 135.135 s, 3.5 MB/s
1028777+0 records in
1028777+0 records out
526733824 bytes (527 MB) copied, 150.444 s, 3.5 MB/s
1309178+0 records in
1309178+0 records out
670299136 bytes (670 MB) copied, 207.966 s, 3.2 MB/s
1342368+0 records in
1342368+0 records out
687292416 bytes (687 MB) copied, 215.574 s, 3.2 MB/s
1412217+0 records in
1412217+0 records out
723055104 bytes (723 MB) copied, 223.328 s, 3.2 MB/s
1513592+0 records in
1513592+0 records out
774959104 bytes (775 MB) copied, 233.346 s, 3.3 MB/s
1621608+0 records in
1621608+0 records out
830263296 bytes (830 MB) copied, 243.346 s, 3.4 MB/s
1636352+0 records in
1636352+0 records out
837812224 bytes (838 MB) copied, 244.829 s, 3.4 MB/s
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