如何在Linux中将相同的标头数据附加到一个标头

Question

my data is seperated by comma delimiter So by talking value before comma as main header column and if the same header occured somewhere elese, apped data into one header by placing open and closed flower brackets

Please consider my example for better understading

Input file data

19,66:BILL
19,34
19,02
21,:0
21,:0
21,:1
21,37
26,:19
26,87
27,35
31,77
31,12
31,202

Output file data

19,{66:BILL}{34}{02}
21,:{0}{:0}{:1}
21,37
26,{:19}{87}
27,35
31,{77}{12}{102}

Answer 1

A solution using awk

$ awk -F, '{a[$1]=a[$1]"{"$2"}"} END{for (i in a) print i FS a[i]}' input.csv

Assuming that the input file contains two columns only, the script constructs an array a by appending the values $2 of all rows with the same index $1 into the same element a[$1]

input.csv

19,66:BILL
19,34
19,02
21,:0
21,:0
21,:1
21,37
26,:19
26,87
27,35
31,77
31,12
31,202

output

19,{66:BILL}{34}{02}
21,{:0}{:0}{:1}{37}
26,{:19}{87}
27,{35}
31,{77}{12}{202}