It's a huge time saving with this command. It's taking less than 5 mins to extract details around 60K employee from around 2.8GB detail file.
Thanks again for your suggestion.
Thank you all for your quick response !! Thanks a lot rwuertn; '-F' option is working and I am able to extract the required data within less time period.
I have 2 files; one file (say, details.txt) contains the details of employees and another file (say, emp.txt) has some selected employee names. I am extracting employee details from details.txt by...