Trivial script will NOT execute

From	Richard Owlett <rowlett@cloud85.net>
Newsgroups	linux.debian.user
Subject	Trivial script will NOT execute
Date	2016-11-05 02:00 +0100
Message-ID	<szXuW-Ff-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Today I've been having weird problems executing scripts.
As I have no valuable data on the partition containing Debian, I 
wiped it and did a fresh install of Debian Jessie (8.6.0) MATE 
desktop environment from a purchased set of DVDs. Earlier today I 
had had reason to create an *,iso of DVD1 of 13 using xorriso. 
The ISO had a MD5SUM matching the one at debian.org .

More than a half-century of trouble shooting *screams* 'operator 
error' ;[
But what????? [Caja reports the execute bit is set ;]

Cut-n-paste from MATE terminal:
root@full-jessier:~# #!/bin/bash -x
root@full-jessier:~# cd /media/root/myrepo
root@full-jessier:/media/root/myrepo# RCO
bash: RCO: command not found
root@full-jessier:/media/root/myrepo# ls
lost+found  new file  RCO  x2  xtract2 (copy)
root@full-jessier:/media/root/myrepo#


The content of RCO [with Linux line endings] is:

F='dvd8_'
N=0
E='.iso'
echo ""
while true
   do
     read -p "press Enter (Ctrl+C to exit)" dummyvar
     let N=N+1
     FILENAME=$F$N$E
     echo $FILENAME
     echo ""
     echo "*********************"
  done


Assistance appreciated.

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Trivial script will NOT execute Richard Owlett <rowlett@cloud85.net> - 2016-11-05 02:00 +0100
  Re: Trivial script will NOT execute "John L. Ries" <jries@salford-systems.com> - 2016-11-05 02:10 +0100
    Re: Trivial script will NOT execute Richard Owlett <rowlett@cloud85.net> - 2016-11-05 02:40 +0100
      Re: Trivial script will NOT execute "John L. Ries" <jries@salford-systems.com> - 2016-11-05 04:30 +0100
      Re: Trivial script will NOT execute David Wright <deblis@lionunicorn.co.uk> - 2016-11-05 16:50 +0100
        Re: Trivial script will NOT execute Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-07 14:00 +0100
          Re: Trivial script will NOT execute David Wright <deblis@lionunicorn.co.uk> - 2016-11-07 14:50 +0100
  Re: Trivial script will NOT execute Christian Seiler <christian@iwakd.de> - 2016-11-05 02:20 +0100
    Re: Trivial script will NOT execute Ben Caradoc-Davies <ben@transient.nz> - 2016-11-05 04:00 +0100
  Re: Trivial script will NOT execute sunrise@mailbug.com - 2016-11-05 02:40 +0100

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