Plan 9 from Bell Labs’s /usr/web/sources/plan9/rc/bin/dmaon

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#!/bin/rc
# dmaon [/dev/sd??/ctl ...] - turn on ide dma, if possible
rfork e
if (~ $#* 0)
	* = /dev/sd[C-H]?/ctl
for (ctl)
	if (test -e $ctl && grep -s '^config .* dma ' $ctl &&
	    ! grep -s '^config (848A|.* dma 00000000 )' $ctl)
		echo 'dma on' >$ctl

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