Wrapping 'sleep' with my 'resleep' function (Resettable sleep) Post: 302356482

Sponsored Content

Top Forums Shell Programming and Scripting Wrapping 'sleep' with my 'resleep' function (Resettable sleep) Post 302356482 by deckard on Friday 25th of September 2009 04:35:50 PM

09-25-2009

Registered User

Wrapping 'sleep' with my 'resleep' function (Resettable sleep)

This is a very crude attempt in Bash at something that I needed but didn't seem to find in the 'sleep' command. However, I would like to be able to do it without the need for the temp file. Please go easy on me if this is already possible in some other way:

How many times have you used the 'sleep' command interactively only to realize that the amount of time you initially specified wasn't enough and you wanted to reset it? Or how many times have you had something sleeping for quite a while but you wanted to know where it was in the sleep countdown? I've found myself in these situations quite a few times when recording a TV show or some other multimedia. So I wrote the 'resleep' functions (which wrap around 'sleep') below which can then either be included in scripts where you'd normally use sleep by itself, or dotted into your environment and run as commands. It's not polished and I'm positive the logic isn't clean, but it's working for me so far. One thing I still need to add is the ability to pass a unit of time (in seconds, minutes, hours) to the wrapped 'sleep' command itself so that my "time units" count can be something other than one second as it is now. For example it would be nice to be able to set it to 30 minutes and then three time units would be 90 minutes. But that will come later... So here it is in all it's ugliness...

SCRIPT EDIT: Demoggified per cfajohnson's comments. Thanks!

Code:

# 'resleep' is a resettable sleep countdown timer.  You specify the initial
# count of time units (in this case seconds).  Then if you need more time
# you echo the new time unit count to /tmp/.dtime which resets the count
# to whatever you specify.

function resleep()
{
timefile=/tmp/.dtime$$
echo $1 > $timefile
dur=$1

while ((dur > 0))
do
  sleep 1
  read dur < $timefile
  countdown=$(($dur-1))
  echo $countdown > $timefile
done

rm $timefile
}

# The 'setsleep' function is used to reset your time unit count.  Example:
# 'setsleep 30' will reset the count to 30 seconds.
# If the countdown is over an error message is presented.
function setsleep()
{
timefile=/tmp/.dtime

if ! [ -e $timefile ]
then
  echo "No countdown file present"
  return
fi

read dur < $timefile
echo "Current countdown: $dur"
echo $1 > $timefile
read dur < $timefile
echo "Reset countdown: $dur"
}

# The 'getsleep' function is used to see where you are in the countdown.
# If the countdown is over an error message is presented.
function getsleep()
{
timefile=/tmp/.dtime

if ! [ -e $timefile ]
then
  echo "No countdown file present"
  return
fi

read dur < $timefile
echo "Current countdown: $dur"
}

As a sidenote, I couldn't think of a good way to do this without using the temp file, although I would have preferred to avoid it. The problem is being able to write to a variable while it's in use. Is there some way to do this without the temp file?

Last edited by deckard; 09-28-2009 at 04:09 PM..

deckard

View Public Profile for deckard

Find all posts by deckard

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

sleep

what is the purpose of the sleep command?

2. Shell Programming and Scripting

Sleep under one second

If I want a script to sleep for less than a second, would I use a decimal? In other words, if I wanted my script to sleep for 1/4 of a second, would I say, SLEEP .25 ??

3. UNIX for Dummies Questions & Answers

Sleep less than 1 second

Does anyone know a way to sleep less than 1 second? Sometimes when I write scripts that iterates a loop many times it would be nice to slow things down, but sometimes 1 second is too much.

4. Shell Programming and Scripting

Help with sleep function

Hey everyone, just entering the linux world, I need some help with a shell script i'm trying to write, the purpose is to check every 10 minutes what was the last time a certain file was modified, and if there is a connection to the server at this moment send an email with the date of the...

5. Programming

C Sleep function hangs @ __kernel_vsyscall ()

This is the gdb backtrace. ^C Program received signal SIGINT, Interrupt. 0xffffe424 in __kernel_vsyscall () (gdb) bt #0 0xffffe424 in __kernel_vsyscall () #1 0xb7e56a70 in __nanosleep_nocancel () from /lib/libc.so.6 #2 0xb7e568bb in __sleep (seconds=0) at sleep.c:138 #3 0x080496d5 in...

6. Shell Programming and Scripting

How the Sleep function will work?

Hi All, I am new to Unix , there i am facing one problem with sleep command. that is .. in while loop i have defined sleep function .. my condition is like this while #i knew this is infinite loop do sleep 200 echo "hello " done. this condition will never become .. true...

7. Shell Programming and Scripting

Sleep while i > 0

Hi, I have a script that runs a process at the beginning and I want to sleep/wait until this process is finished and then continue with the rest of the script. I am trying with this, but it is not working: process=`ps -ef | grep "proc_p01 -c" | grep -v grep | wc -l` if ; do sleep 10 done...

8. Programming

Sleep function not detected

Hello Im using geany to write my c codes. Below is my code to make the internal LED of beaglebone flashing. But i cant seem to use the sleep or delay to make the program wait for a couple of miliseconds. I've included all include files that i can find but none of it solve the problem. Any help is...

9. Programming

Doubt with signals and sleep function

Hi , I have a doubt with signals and sleep function. In a program i have this while(1) { //do some work sleep(1); }And in a thread i have something like this union sigval data; char message; char msg; data.sival_int=0; while(1) { ...

LEARN ABOUT DEBIAN

timetrans

TIMETRANS(1p)						User Contributed Perl Documentation					     TIMETRANS(1p)

NAME

       timetrans - Converts time into time

SYNOPSIS

	 timetrans [units-options] [-count]

DESCRIPTION

       timetrans converts time from one type of unit to another.  If any of the units options are specified, then timetrans will convert those
       time units into the number of seconds to which they add up.  If given the count option, timetrans will convert that number of seconds into
       the appropriate number of weeks, days, hours, minutes, and seconds.  The converted result is printed out.  Units options cannot be
       specified in the same execution as the count option, and vice versa.

       timetrans is intended for use with DNSSEC-Tools, for calculating a zone's expiration time.

OPTIONS

   Units Options
       The converted value of each unit is totaled and a single result printed.

       -seconds seconds
	   Count of seconds to convert to seconds.

       -minutes minutes
	   Count of minutes to convert to seconds.

       -hours hours
	   Count of hours to convert to seconds.

       -days days
	   Count of days to convert to seconds.

       -weeks weeks
	   Count of weeks to convert to seconds.

   Count Option
       The specified seconds count is converted to the appropriate number of weeks, days, hours, minutes, and seconds.

       -count seconds
	   Count of seconds to convert to the appropriate set of units.

   Other Options
       timetrans has the following miscellaneous options.

       -Version
	   Displays the version information for timetrans and the DNSSEC-Tools package.

EXAMPLES

       Example 1:  Converting 5 days into seconds

	   $(42)> timetrans -days 5
	   432000

       Example 2:  Converting 2 weeks into seconds

	   $(43)> timetrans -w 2
	   1209600

       Example 3:  Converting 8 days and 8 hours into seconds

	   $(44)> timetrans -d 8 -hours 8
	   720000

       Example 4:  Converting 1 week, 1 day, and 8 hours into seconds

	   $(46)> timetrans -w 1 -days 1 -h 8
	   720000

       Example 5:  Converting 14 weeks, 4 days, 21 hours, 8 minutes, and 8 seconds into seconds

	   $(47)> timetrans -w 14 -d 4 -h 21 -m 8 -s 8
	   8888888

       Example 6:  Converting 720000 seconds into time units

	   $(48)> timetrans -c 720000
	   1 week, 1 day, 8 hours

       Example 7:  Converting 1814421 seconds into time units

	   $(49)> timetrans -c 1814421
	   3 weeks, 21 seconds

       Example 8:  Converting 8888888 seconds into time units

	   $(50)> timetrans -c 8888888
	   14 weeks, 4 days, 21 hours, 8 minutes, 8 seconds

COPYRIGHT

       Copyright 2004-2012 SPARTA, Inc.  All rights reserved.  See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

       Wayne Morrison, tewok@tislabs.com

SEE ALSO

       zonesigner(8)

       Net::DNS::SEC::Tools::timetrans.pm(3)

perl v5.14.2							    2012-06-21							     TIMETRANS(1p)