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====== Remove Special Chars from Windows files ======
<color #db5f0b>Jul 2017</color>
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If you have copied any text files or text strings from a Windows PC, then you might find that there are still special characters in this file that stop you executing it as a script on a linux computer. These special characters are typically carriage returns and line feeds.
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Below is a file that I copied from Windows to a CentOS linux server, it dind't matter if I copied the file, or did a copy/paste, the issue still arose. After each line you can see a <color #ed1c24>^M</color> character, which is a Windows carriage return (Linux doesn't use Carriage returns, only line feeds, Windows uses both).
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When you edit the file in vi, you can't see these special characters, you have use another switch with vi to show them. Run vi using a <color #ed1c24>-b</color> switch.
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    vi -b filename

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#!/bin/bash<color #ed1c24>^M</color>\\ 
# Install useful tools<color #ed1c24>^M</color>\\ 
<color #ed1c24>^M</color>\\ 
yum install epel-release -y<color #ed1c24>^M</color>\\ 
yum install htop -y<color #ed1c24>^M</color>\\ 
yum install nload -y<color #ed1c24>^M</color>\\ 
yum install iperf -y<color #ed1c24>^M</color>\\ 
yum install tcpdump -y<color #ed1c24>^M</color>\\ 
yum install ncdu -y<color #ed1c24>^M</color>\\ 
yum install net-tools -y<color #ed1c24>^M</color>\\ 
rpm --import http://packages.atrpms.net/RPM-GPG-KEY.atrpms<color #ed1c24>^M</color>\\ 
touch /etc/yum.repos.d/atrpms.repo<color #ed1c24>^M</color>\\ 
echo "[atrpms]<color #ed1c24>^M</color>\\ 
name=Fedora Core \$releasever - \$basearch - ATrpms<color #ed1c24>^M</color>\\ 
baseurl=http://dl.atrpms.net/el\$releasever-\$basearch/atrpms/stable<color #ed1c24>^M</color>\\ 
gpgkey=http://ATrpms.net/RPM-GPG-KEY.atrpms<color #ed1c24>^M</color>\\ 
enabled=1<color #ed1c24>^M</color>\\ 
gpgcheck=1" > /etc/yum.repos.d/atrpms.repo<color #ed1c24>^M</color>\\ 
yum install ffmpeg -y\\ 

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You can remove these special characters in Linux using a variety of methods, here are two.
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    1. In vi, just delete the ^M characters and save the file.
    
    2. Install dos2unix (yum install dos2unix) and execute this on your file (dos2unix filename) 
       and it will remove them for you, handy if it is a big file.
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