Try "look something" ... it returns nothing. RHEL4 has broken look command and the words dictionary. The dictionary has to be sorted by "sort --ignore-case --dictionary-order". This problem has been fixed in dists >=FC5.
*** Bug 153276 has been marked as a duplicate of this bug. ***
*** Bug 234279 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2007-0236.html