Diff command for comparing files more than 2GB in solaris

rsh is faster than ssh, but I prefer ssh. this should work substituting ssh with rsh.

gtar -cf - files | ssh user@host "(cd /destPath ; gtar -xf -)"

The key here is enclosing in parenthesis.

Remove the slash from the filename in the if statement. The way you have it, it's checking for the file in the root directory, but later it's created in whatever is the current directory.

Also, your script basically says "if suid.old doesn't exist then do a diff".

You might want something like:

#!/bin/bash
if [ ! -f "suid.old" ]
then
    find / -perm -4000 -o -perm -2000 ls > suid.old
fi

if [ ! -f "suid.new" ]
then
    find / -perm 4000 -o -perm -2000 ls > suid.new
fi

diff suid.old suid.new > newchanges.list
mv suid.new suid.old

This says: "If suid.old doesn't exist, create it. If suid.new doesn't exist, create it. Now that they've been created (or already exist) do the diff."