I have a report for year-month entries like below
201703 5
201708 10
201709 20
201710 40
201711 80
201712 100
201802 0
201803 25
201804 50
201805 50
201806 150
201807 300
201808 200
201902 10
I need to sum the year-month entries by year and print after all the months for that particular year. The year-month can have missing entries for any month(s). For those months the a dummy value (0) should be inserted.
Required output:
201703 5
201704 0
201705 0
201706 0
201707 0
201708 10
201709 20
201710 40
201711 80
201712 100
2017 255
201801 0
201802 0
201803 25
201804 50
201805 50
201806 150
201807 300
201808 200
201809 0
201810 0
201811 0
201812 0
2018 775
201901 0
201902 10
201903 0
2019 10
I can get the summary of year by using below command.
awk ' { c=substr($1,0,4); if(c!=p) { print p,s ;s=0} s=s+$2 ; p=c ; print } ' ym.dat
But, how to insert entries for the missing ones?. Also the last entry should not exceed current (system time) year-month. i.e for this specific example, dummy values should not be inserted for 201904..201905.. etc. It should just stop with 201903
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