We would hope that you understand how to set the PATH environment variable so that your script can find the mailx, shnfix, and uuencode utilities on your system. I have never heard of shnfix, but the other two should be available on most UNIX and UNIX-like systems. The directories in which they are located, however, varies from system to system.

If is strange that you define a variable named FILE1 but never use it. It is strange that you create a file with a name similar (but sometimes not identical to the pathname assigned to FILE1), but never reference that file after it is created.

We have no idea when you should be using $FILE and when you should be using $FILE1 since we have no idea what shnfix does nor what you want to do with the contents of either of those files in the remainder of your script.

If we knew what operating system and shell you were using, we knew what shnfix does, we knew what you were trying to accomplish with your script, and we knew where the utilities that your script can't find were located; then we might be able to help you fix your script. Without all of this information, we have a MUCH lower chance of being able to fix your script than you do. We presume that you know what the utilities you are invoking are intended to do and that you know what your script is trying to do. Since we don't know those things, how do you expect us to advise you on the proper changes that would make your script do what you want it to do?