Processing 2 files with different field separators using awk

Question

Let\'s say I have 2 files :

$ cat file1
A:10
B:5
C:12

$ cat file2
100 A
50 B
42 C

I\'d like to have something like :

A 10          


        

Answer 1

Just set FS between files:

awk '...' FS=":" file1 FS=" " file2

i.e.:

$ awk 'NR==FNR{a[$1]=$2;next}{print $2,a[$2],$1}' FS=":" file1 FS=" " file2
A 10 100
B 5 50
C 12 42