融合两个csv文件

Question

I am trying to fuse two csv files this way using BASH.

files1.csv :

Col1;Col2
a;b
b:c

file2.csv

Col3;Col4
1;2
3;4

result.csv

Col1;Col2;Col3;Col4
a;b;0;0
b;c;0;0
0;0;1;2
0;0;3;4

The '0's in the result files are just empty cells. I tried using paste command but it doesn't fuse it the way I want.

paste -d';' file1 file2 

Is there a way to do it using BASH?

Thanks.

Answer 1

One in awk:

$ awk -v OFS=";" '
FNR==1  { a[1]=a[1] (a[1]==""?"":OFS) $0; next }    # mind headers
FNR==NR { a[NR]=$0 OFS 0 OFS 0; next }              # hash file1
        { a[NR]=0 OFS 0 OFS $0 }                    # hash file2
END     { for(i=1;i<=NR;i++)if(i in a)print a[i] }  # output
' file1 file2
Col1;Col2;Col3;Col4
a;b;0;0
b:c;0;0
0;0;1;2
0;0;3;4