I use shell scripts for a few jobs.

Recently I rebuilt a laptop and installed a few scripts from a working machine.  The other day I went to run one of the scripts from a command line and got the following:

/bin/bash^M: bad interpreter: No such file or directory

Now the new machine had an identical setup to the old and the script I was trying to run had the right permissions(and of course ran perfectly on the old machine), so the problem had to lie with the formatting of the script file ( and the ^M was a bit of a hint too?).  Somehow the file transfer had corrupted the script file and trying to edit it didn't fix it.

A simple fix. 

I used the following:

sed -i -e 's/\r$//' myfile.sh

The file then ran perfectly.