Show progress during dd copy

tty 1

$ dd if=/dev/random of=/dev/null bs=1K count=100

0+14 records in
0+14 records out
204 bytes (204 B) copied, 24.92 seconds, 0.0 kB/s

tty 2 

$ pgrep -l '^dd$'

8789 dd 

$ kill -USR1 8789


$ watch -n 10 kill -USR1 8789

Reference :
Linux Commando: Show progress during dd copy

硬碟測速

讀取：
# hdparm -tT /dev/sda1

寫入：
// 1.2GB
$ dd if=/dev/zero of=/tmp/test.img bs=8k count=256k