AWK Sum and group by : output with headers - awk

Question

I have a huge csv with this structure (sample):
| DATE | WEEKDAY | Shop Code |Shop Manager|Item Presentation Time|Item Sell|
|02-Mar |MONDAY | BOG | Tom |1030 |0 |
|02-Mar |TUESDAY | TEF | Lucas |1300 |1 |
|02-Mar |WEDNESDAY | TDC | Eriberto |1300 |1 |
|02-Mar |THURSDAY | TEF | Lucas |1300 |1 |
|02-Mar |FRIDAY | TEF | Lucas |1300 |1 |
|02-Mar |SATURDAY | GTY | Maya |1600 |1 |
|02-Mar |SUNDAY | TDC | Eriberto |1300 |1 |
I am interested in the sum of successful event ($6)per weekday, the count of presentation per weekday ($2), and the percentual of successful event ( sum $6/count $2 *100)
I wrote the following script:
#!/bin/awk -f
BEGIN {FS = OFS = ","}
{if (NR!=1) a[$2]+=$6;count[$2]++$2}END{for (i in a){ print i","a[i] "," count[i]","a[i]/count[i]*100}}
The script runs:
$ awk -f script.awk raw_file.csv > new_file.csv
It works out perfectly and the output is:
|MONDAY | 2 | 10 |0.20|
|TUESDAY | 18 | 30 |0.60|
|WEDNESDAY | 10 | 20 |0.50|
|THURSDAY | 1 | 20 |0.05|
|FRIDAY | 1 | 15 |0.07|
|SATURDAY | 60 | 100 |0.60|
|SUNDAY | 47 | 80 |0.59|
However I would like to add in the output the header (WEEKDAY,SUCCESSFUL_EVENTS,TOTAL_EVENTS and SUCCESSFUL_RATE. I have no idea how to put in the same script the NR with the header.
I can show the output with:
awk 'NR==1 {print
"WEEKDAY","SUCCESSFUL_EVENTS","TOTAL_EVENTS","SUCCESSFUL_RATE"}{print
$0}' new_file.csv
but no way to integrate this in the script
Any suggestion is really appreciated

Answer 1

You can do this in the begin section of your script:
#!/bin/awk -f
BEGIN {
FS = OFS = ","
print "WEEKDAY", "SUCCESSFUL_EVENTS", "TOTAL_EVENTS", "SUCCESSFUL_RATE"
}
# ...