I am taking a class in UNIX and have written a script that needs to countdown from a number that is read in from the keyboard to zero. If no number is given the start of the countdown should default to 10.
I can't get this to do the default
#! /bin/sh
echo Enter a number here to countdown... (2 Replies)
Hi guys, I've found two nifty little scripts on these forums one which detects if the F5 key has been pressed:
#/bin/sh
_key()
{
local kp
ESC=$'\e'
_KEY=
read -d '' -sn1 _KEY
case $_KEY in
"$ESC")
while read -d '' -sn1 -t1 kp
do
_KEY=$_KEY$kp
... (0 Replies)
Hi all,
Does anyone know of any FUN countdown script that I can use for my script? At the moment, am just using sleep 10 or more and then print stuff into the screen to allow more time for the user to decide whether they want to continue running the script or abort?
Just thought of wanting... (3 Replies)
Hello, I have another problem with my script - I would like to have a countdown timer visible on the screen, and at the same time, I want te be able to do something else. And when the time runs out, I need to know about that inside the script somehow and do some action. I guess that would require 2... (3 Replies)
In the below bash when the perl is it possible to hide the commands from running on screen and display a process countdown?
For example, on the cygwin screen now the user sees each process in the command running as running protocol refGene, running protocol popfreq_all, etc... Could a... (0 Replies)
I would like this to work with seconds as well.
#!/bin/bash
#
if ; then
echo "Incorrect usage ! Example:"
echo './CountDown.sh -d "Jun 10 2011 16:06"'
echo 'or'
echo './CountDown.sh -m 90'
exit 1
fi
now=`date +%s`
if ; then
until=`date -d... (7 Replies)
Discussion started by: drew77
7 Replies
LEARN ABOUT FREEBSD
i8254
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