Hi,

I have two files file A and File B. File A is a error file and File B is source file. In the error file. First line is the actual error and second line gives the information about the record (client ID) that throws error. I need to compare the first field (which doesnt start with '//') of file A with fifth field of file B. It field values in file A and file B matches i need to write it to output file as below.

File A
// 223 missing
223,Jan,ee,bla,bla

// data not found
254-11,Jan,ee,bla,bla

// data rejected
214-1,Jan,ee,bla,bla

File B
aaaa,bbbb,ccc,dddd,20054-11,fff,ggg...
aaaa,bbbb,ccc,dddd,254-11,fff,ggg...
aaaa,bbbb,ccc,dddd,2545456-1,fff,ggg...

output:
// data not found
254-11,Jan,ee,bla,bla

if First field of File A and Fifth field of File B (254-11) matches, then i need to write the records from file A (current line and the previous line) to a output file as above.

I could achieve it very easily using awk and grep with if loop. Problem is files are hugh. Nearly 1 million records are in both the files. script run for 3-4 hours. I would appreciate if some one could help me in giving good logic or better script which could complete the task in few minutes.

Note: File A and File B look exactly in the same format. Caution about the blanks in file A and Client ID fomat 000 or 000-0 or 000-00.