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Top Forums Shell Programming and Scripting Display runnning countdown in a bash script? Post 302281965 by Starcast on Thursday 29th of January 2009 11:59:00 PM
Old 01-30-2009
Thanks!

That is exactly what I needed Thanks! At first it was counting down and then starting the capture, but I just added an "&" and she works great!

Timer

(Just wanted to include this for search purposes...)
 

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ATTIMER(4)						   BSD Kernel Interfaces Manual 						ATTIMER(4)

NAME
attimer -- i8254 Programmable Interval Timer (AT Timer) driver SYNOPSIS
This driver is a mandatory part of x86 kernels. The following tunables are settable from the loader(8): hint.attimer.X.clock controls support for the event timer functionality. Setting this value to 0 disables it. The default value is 1. hint.attimer.X.timecounter controls support for the time counter functionality. Setting this value to 0 disables it. The default value is 1. hw.i8254.freq allows overriding the default counter frequency. The same value is also available at run-time via the machdep.i8254_freq sysctl. DESCRIPTION
This driver uses i8254 Programmable Interval Timer (AT Timer) hardware to supply the kernel with one timecounter and one event timer, and to generate sound tones for the system speaker. This hardware includes three channels. Each channel includes a 16 bit counter which decreases with a known, platform-dependent frequency. Counters can operate in several different modes, including periodic and one-shot. The output of each channel has platform-defined wiring: one channel is wired to the interrupt controller and may be used as event timer, one channel is wired to the speaker and used to generate sound tones, and one timer is reserved for platform purposes. The attimer driver uses a single hardware channel to provide both time counter and event timer functionality. To make this possible, the respective counter must be running in periodic mode. As a result, the one-shot event timer mode is supported only when time counter func- tionality is disabled. The event timer provided by the driver is irrelevant to CPU power states. SEE ALSO
apic(4), atrtc(4), eventtimers(4), hpet(4), timecounters(4) BSD
May 26, 2014 BSD
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