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Top Forums Shell Programming and Scripting Display runnning countdown in a bash script? Post 302281959 by Corona688 on Thursday 29th of January 2009 11:00:22 PM
Old 01-30-2009
This uses a few tricks to do what you want:
  • The printf command does NOT append a linefeed automatically unless you tell it to.
  • Setting IFS to something else lets the shell split things apart into arrays on whatever delimiter you want, in this case , :.
  • The date command can be used to produce time in seconds.
  • Carriage returns return the cursor to the beginning of the line without moving to the next line.

Code:
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 "        "
}

countdown "00:07:55"

 

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rdate(1M)						  System Administration Commands						 rdate(1M)

NAME
rdate - set system date from a remote host SYNOPSIS
rdate hostname DESCRIPTION
rdate sets the local date and time from the hostname given as an argument. You must have the authorization solaris.system.date on the local system. Typically, rdate is used in a startup script. The inetd daemon responds to rdate requests. To enable inetd response, the lines invoking the time command in inetd.conf must not be com- mented out. USAGE
The rdate command is IPv6-enabled. See ip6(7P). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWrcmdc | +-----------------------------+-----------------------------+ SEE ALSO
inetd(1M), inetd.conf(4), attributes(5), ip6(7P) SunOS 5.10 15 Feb 2001 rdate(1M)
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