Ubuntu :: Text In Shell Breaks Up?

I work a lot with Unix bash shell environment. Whenever I go down the directory tree to several subdirectories, i.e., /home/a/b/c/d/ and so on and type in a long command, what happens is that command text wraps around onto the new line but when trying to edit command I can only go back to the beginning of the new line. So, for, instance, say I go to directory and type something like:

/home/a/b/c/d/find . -type f -exec sed -i <- end of line
's/blah/blah/g' {} ; <- new line

Here, the problem is I can't go back to the real beginning of my command that starts with "find", I can only scroll to the beginning of the new line with the part "'s/blah/blah/g' {} ;"

So I effectively loose control over what I typed and can't edit it when the command wraps to a new line. Does anyone else experience this problem?

I also have this problem on our Debian servers so I always have to make sure I type the right command the first time because I can't move back and forth to edit it when it wraps to a new line.