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Full Discussion: Countdown timer with seconds
Operating Systems Linux Ubuntu Countdown timer with seconds Post 303033506 by drew77 on Sunday 7th of April 2019 06:17:58 AM
Old 04-07-2019
Added fi.

Code:
if [ "$1" = "-m" ] ; then
     until=`expr 60 \* $2`
      until=`expr $until + $now`
      sec_rem=`expr $until - $now`
      echo "-m"
      if [ $sec_rem -lt 1 ]; then
          echo "$2 is already history !"
      fi
  fi

Code:
andy@7_~/Downloads$ test.sh -s 20
expr: syntax error
-s
20 is already history !


Last edited by RudiC; 04-07-2019 at 07:36 AM..
 

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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)
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