Merge two files using awk in linux

Question

I have a 1.txt file:

betomak@msn.com||o||0174686211||o||7880291304ca0404f4dac3dc205f1adf||o||Mario||o||Mario||o||Kawati
zizipi@libero.it||o||174732943.0174732943         


        

Answer 1

If your actual Input_file(s) are same as shown sample then following awk may help you in same.

awk -v s1="||o||" '
FNR==NR{
  a[$9]=$1 s1 $5;
  b[$9]=$13 s1 $17 s1 $21;
  next
}
($1 in a){
  print a[$1] s1 $2 FS $3 s1 b[$1]
}
' FS="|" 1.txt FS=":" 2.txt

EDIT: Since OP has changed requirement a bit so providing code as per new ask where it will create 2 files too 1 file which will have ids present in 1.txt and NOT in 2.txt and other will be vice versa of it.

awk -v s1="||o||" '
FNR==NR{
  a[$9]=$1 s1 $5;
  b[$9]=$13 s1 $17 s1 $21;
  c[$9]=$0;
  next
}
($1 in a){
  val=$1;
  $1="";
  sub(/:/,"");
  print a[val] s1 $0 s1 b[val];
  d[val]=$0;
  next
}
{
  print > "NOT_present_in_2.txt"
}
END{
for(i in d){
  delete c[i]
};
for(j in c){
  print j,c[j] > "NOT_present_in_1.txt"
}}
' FS="|" 1.txt FS=":" OFS=":" 2.txt