[awk] timestamp on 1st column
|awk ' { print strftime("[%Y-%m-%d %H:%M:%S]", systime()),$0 } ' --------------- output example # echo aaaa |awk ' { print strftime("[%Y-%m-%d %H:%M:%S]", systime()),$0 } ' [2016-01-29 20:24:53] aaaa
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