Is the source that is producing hostsocket.txt a windows system? You never said anything before about having <carriage-return><newline> as your line terminator (rather than the standard UNIX <newline> by itself) before. Your sample file didn't have any <carriage-return> characters in it.

Are you copying our suggested code onto your system using an editor that uses <carriage-return><newline> instead of <newline> as line terminators? If so, it is no wonder that none of our code is working for you on AIX.

Does your input file really contain <carriage-return> characters?
Do you really want <carriage-return> characters in the output?
Do you want the script to remove the trailing circumflex characters as shown in your first example?
Do you want the script to add lines as shown in your first example?
To identify the line to be changed, which of the following do we need to match at the start of a line:

Code:

leprechaun.host.uri.list=raft://rt920test.info53.com:22025<carriage-return>
leprechaun.host.uri.list=raft://rt920test.info53.com:22025
leprechaun.host.uri.list=raft://
leprechaun.host.uri.list=raft:
leprechaun.host.uri.list=raft
leprechaun.host.uri.list=
leprechaun.host.uri.list

(where <carriage-return> is a visual representation of the single-byte carriage return character)? If it is one of the first two above, am I correct in assuming that we should accept the match only if the match is to the entire input line? You seem to be supplying your script with only the replacement text rather than the details of the IP and Port that are being changed, and your grep was looking for the next to the last entry above; but you latest message seems to be saying we should look for one of the first two???