Bash - countdown timer Post: 302597805

Sponsored Content

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..

xqwzts

View Public Profile for xqwzts

Find all posts by xqwzts

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

shell script - loop to countdown

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. Shell Programming and Scripting

Display runnning countdown in a bash script?

I am looking for a way to display on a single line, a running countdown for a given amount of time in a terminal using a bash script. I am looking for this to use as part of a larger bash script that captures Video. The script sets up a bunch of parameters for DVgrab, and one of the parameters...

3. UNIX for Dummies Questions & Answers

countdown in unix?

is there a script to preform a countdown from 10 seconds to 0?

4. Shell Programming and Scripting

countdown to christmas

was wondering if there was a script that would countdiwn the days until christmas

5. Shell Programming and Scripting

Stop! (the countdown!) :-) shell script help

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 ...

6. Shell Programming and Scripting

Anyone know of any FUN countdown script

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...

7. Shell Programming and Scripting

Perl script countdown

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...

8. Shell Programming and Scripting

Bash process timer

I have a bash with several processes in it, that I would like to include a progress bar or percentage complete. Below are two separate processes that, so the user knows that something is happening, there is an an indicator for each process. Maybe, at the start of each new process a printf the...

9. Ubuntu

Countdown timer with seconds

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...

10. UNIX for Beginners Questions & Answers

Banner Countdown Timer

Hello. I am pretty new to unix and shell scripting and I was wondering if there might be a way to banner a countdown timer inside a script. We currently have an existing script that does a 2 minute sleep but thought it might be fun to actually make it banner a countdown timer until it is finished....

LEARN ABOUT MINIX

fork

FORK(2) 							System Calls Manual							   FORK(2)

NAME

       fork - create a new process

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       pid_t fork(void)

DESCRIPTION

       Fork causes creation of a new process.  The new process (child process) is an exact copy of the calling process except for the following:

	      The child process has a unique process ID.

	      The child process has a different parent process ID (i.e., the process ID of the parent process).

	      The  child  process has its own copy of the parent's descriptors.  These descriptors reference the same underlying objects, so that,
	      for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in  the
	      child  process  can affect a subsequent read or write by the parent.  This descriptor copying is also used by the shell to establish
	      standard input and output for newly created processes as well as to set up pipes.

	      The child starts with no pending signals and an inactive alarm timer.

RETURN VALUE

       Upon successful completion, fork returns a value of 0 to the child process and returns the process ID of the child process  to  the  parent
       process.   Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
       indicate the error.

ERRORS

       Fork will fail and no child process will be created if one or more of the following are true:

       [EAGAIN]       The system-imposed limit on the total number of processes under execution would be exceeded.  This limit	is  configuration-
		      dependent.  (The kernel variable NR_PROCS in <minix/config.h> (Minix), or <minix/const.h> (Minix-vmd).)

       [ENOMEM]       There is insufficient (virtual) memory for the new process.

SEE ALSO

       execve(2), wait(2).

3rd Berkeley Distribution					   May 22, 1986 							   FORK(2)