Bash - countdown timer Post: 302597805

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Top Forums Shell Programming and Scripting Bash - countdown timer Post 302597805 by xqwzts on Sunday 12th of February 2012 08:54:48 AM

02-12-2012

Registered User

Thank you, but I don't have much time for learning how the screen works, so I would be glad to find some other way. Here is a test srcipt that I came up with so far:

Code:

#!/bin/bash

function countdown()
{
        local OLD_IFS="${IFS}"
        IFS=":"
        local ARR=( $1 )
        local SECONDS=$((  (ARR[0] * 60 * 60) + (ARR[1] * 60) + ARR[2]  ))
        local START=$(date +%s)
        local END=$((START + SECONDS))
        local CUR=$START

        while [[ $CUR -lt $END ]]
        do
                CUR=$(date +%s)
                LEFT=$((END-CUR))
                printf "\r%02d:%02d:%02d" \
                        $((LEFT/3600)) $(( (LEFT/60)%60)) $((LEFT%60))

                sleep 1
        done
        IFS="${OLD_IFS}"
        echo "        "
}

first()
{
  echo "before fork"
  printf "\033c"
}

parent()
{
  while [ 1 ]; do
  echo -ne "\r\e[4H"
  echo -n "parent"
  done
}

child()
{
echo -ne "\r\e[3H"
countdown "00:07:55"
}

first; parent & child

I would like, for example, the child process to print the time in the third line of the terminal, and the parent - just write "parent" multiple times in 4th line, in the same place, by overwriting the previous one. But both processes seem to be writing in the same line - can it be fixed somehow?

Last edited by xqwzts; 02-12-2012 at 10:19 AM..

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LEARN ABOUT DEBIAN

stopwatch

STOPWATCH(1x)															     STOPWATCH(1x)

NAME

       stopwatch -- a stopwatch and timer program

SYNOPSIS

       stopwatch

DESCRIPTION

       stopwatch  does what its name implies - enables hand timing much like a physical stopwatch. It can also be used as a countdown timer. Stop-
       watch has millisecond accuracy and no artificial limit on hours.

DIRECTIONS

       Press "start" to start the stopwatch and "stop" to stop it. "record" records the current time and selects it so	that  it  can  readily	be
       pasted  into  other programs. Recorded times are marked with an L for "lap" or T for "total". When stopped, you can cut/paste/edit the time
       by hand and set it to any valid time. "zero" resets the time to zero. Holding down the shift key while pressing record or zero, records and
       then zeros the time.

       Time  moves  forward  or  backward  according  to the Run menu. By default, time is stopped automatically when either the lap or total time
       reaches zero. To disable the automatic stop, unselect Run -> Stop At Zero.

AUTHOR

       This manual page was adapted from the stopwatch documentation written by Don Libes. Permission is granted to copy, distribute and/or modify
       this manpage under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																     STOPWATCH(1x)