Human readable uptime - awk
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Public domain
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    awk '{
        sec = int($1)
        day = int(sec/3600/24)
        sec -= day*24*3600
        hour = int(sec/3600)
        sec -= hour*3600
        min = int(sec/60)
        print day"d "hour"h "min"m"
    }' /proc/uptime

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_BY: Pejman Moghadam_  
_TAG: awk, uptime_  
_DATE: 2011-12-09 11:30:39_