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Re:dd built-in progress introduced in coreutils 8.24 by justin_vanw on Sunday January 10, 2016 @10:11PM (#10878544)
It's SIGUSR1 on Linux, however there is no signal bound to ^T in Linux, nor is it apparently possible to bind new ones.

`killall -USR1 dd` works like a charm, or for the impatient: watch killall -USR1 dd

Re:dd built-in progress introduced in coreutils 8.24 by oxplot on Monday January 11, 2016 @02:20AM (#10879338)
This example highlights a very useful alternative function of `watch`: to simply run a command on regular intervals without caring about the output.
Re:dd built-in progress introduced in coreutils 8.24 by agnivade on Tuesday January 12, 2016 @10:49PM (#10892210)
Yea, but its a pain to open another tab and run another command and switch back to this tab to see the progress.

Why they didn't give a progress bar in the first place beats me.