Victor, > From stdin, to stdout, probably. > awk to the rescue. Fill in the dots, and > awk 'v10 {print v10} {v10=v9} {v9=v8} ..... {v2=v1} {v1=$0}' > can actually be used between stdin and stdout. I tried the following on Solaris 8 cat test.txt | awk 'v10 {print v10} {v10=v9} {v9=v8} {v8=v7} {v7=v6} {v6=v5} {v5=v4} {v4=v3} {v3=v2}{v2=v1} {v1=$0}' > test.out And was returned the following: awk: syntax error near line 1 awk: bailing out near line 1 Any clue? (I am currently deciding where to set my priorities: Learn more about Postfix, awk, maildrop or mailproc to catch up on everybody's suggestions. (c: ) Thanks, Bjorn -------------------------------------------------------------------------------- The information contained herein is confidential and is intended solely for the addressee. Access by any other party is unauthorised without the express written permission of the sender. If you are not the intended recipient, please contact the sender either via the company switchboard on +44 (0)20 7623 8000, or via e-mail return. If you have received this e-mail in error or wish to read our e-mail disclaimer statement and monitoring policy, please refer to http://www.drkw.com/disc/email/ or contact the sender. --------------------------------------------------------------------------------