Hi, The delivered version of sort (under Linux) seems to give expected results given with Red Hat 5.2 and 6.0, where unfortunate the version as included under Red Hat 6.2 makes me dizzy. Am I missing something here ??? Red Hat Linux release 5.2 (Apollo) sort (GNU textutils) 1.22 ===================================================== <wtenhave@kristie:1> cat > /tmp/P 1 1 2 4 5 <wtenhave@kristie:2> od -c /tmp/P 0000000 1 \n 1 \n 2 \n 4 \n 5 \n 0000012 <wtenhave@kristie:3> /bin/cat /tmp/P | /bin/sort -n | /usr/bin/uniq 1 2 4 5 Red Hat Linux release 6.2 (Zoot) sort (GNU textutils) 2.0a ===================================================== <wtenhave@berend:1> cat > /tmp/P 1 1 2 4 5 <wtenhave@berend:2> od -c /tmp/P 0000000 1 \n 1 \n 2 \n 4 \n 5 \n 0000012 <wtenhave@berend:3> /bin/cat /tmp/P | /bin/sort -n | /usr/bin/uniq 5 1 4 2 -- -- Wim ten Have. AUDIX: 245 2981 Phone: (+31) 346 582981, Fax: Euro (+31) 346 552884, Room (+31) 346 558415