[awk] timestamp on 1st column

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|awk ' { print strftime("[%Y-%m-%d %H:%M:%S]", systime()),$0 } '

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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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