Bash - countdown timer Post: 302597879

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Top Forums Shell Programming and Scripting Bash - countdown timer Post 302597879 by drl on Sunday 12th of February 2012 06:59:36 PM

02-12-2012

Registered User

Hi.

I'd rather a program handle all the escapes, special sequences, etc. Here's an example that writes in a few places in my display:

Code:

#!/usr/bin/env bash

# @(#) s1	Demonstrate tput row column addressing, 0 0 upper left.

pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }

SLEEP=${1-10}

COLS=$( tput cols )
ROWS=$( tput lines )
tput init
tput clear

# Put in line (row) numbers.
for (( row=0 ; row < $ROWS ; row++ ))
do
  tput cup $row 0
  echo -n $row
done

tput cup 0 10
echo -n " This is the top row."

tput cup 3 4
echo -n "Hello, world (one)."
echo "Hello, world (two)."
echo "Hello, world (three)."

tput cup 5 4
echo -n "Midday, world (one)."
echo "Midday, world (two)."
echo "Midday, world (three)."

tput cup 8 4
echo -n "Goodbye, world (one)."
echo "Goodbye, world (two)."
echo "Goodbye, world (three)."

tput cup 10 30
echo -n "Sleep, clear, reset ..."
sleep $SLEEP
tput clear
tput reset

C=$HOME/bin/context && [ -f $C ] && $C tput
pe

exit 0

which will produce output in several lines on the screen.

See man tput for details ... cheers, drl

drl

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mktimer

mktimer(3C)															       mktimer(3C)

NAME

       mktimer - allocate a per-process timer

SYNOPSIS

DESCRIPTION

       The  function is used to allocate a per-process timer using the specified system-wide clock as the timing base.	returns an unique timer ID
       of type used to identify the timer in timer requests (see gettimer(3C)).  specifies the system-wide clock to be used as the timing base for
       the new timer.  specifies the mechanism by which the process is to be notified when the timer expires.

       supports one per-process timer with a of and of

       If is the system causes a signal to be sent to the process whenever the timer expires.

       For the machine-dependent clock resolution and maximum value are and seconds, respectively.  These constants are defined in

RETURN VALUE

       Upon  successful completion, returns a which can be passed to the per_process timer calls.  If unsuccessful, returns a value of and sets to
       indicate the error.

ERRORS

       fails if any of the following conditions are encountered:

	      [EAGAIN]	  The calling process has already allocated all of the timers it is allowed.

	      [EINVAL]	  is not defined, or does not allow the specified notification mechanism.

FILES

       SEE ALSO
	      timers(2), getclock(3C), gettimer(3C), reltimer(3C), rmtimer(3C), setclock(3C), thread_safety(5).

STANDARDS CONFORMANCE

																       mktimer(3C)