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Forum: UNIX for Beginners Questions & Answers 10-10-2018

Delete records that do not belong to that day

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Try awk -F, 'NR == 1 {("date -d\"" $2 "+1day\"...

Try
awk -F, 'NR == 1 {("date -d\"" $2 "+1day\" +\"%d-%b-%Y\"") | getline DT} $2 !~ DT' file
a,31-Jul-2018 12:00,14
a,31-Jul-2018 12:01,13
a,31-Jul-2018 12:02,15
a,31-Jul-2018 12:03,19
and so on...

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