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Documentation:
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Cisco IOS Shell Configuration Guide: http://bit.ly/2kwMyYN

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Books:
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Cisco Press Book: https://amzn.to/2LpaU1a
Good O'Reilly Book: https://amzn.to/2Lpbw6Z

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Free TFTP Server: 
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Free SolarWinds TFTP Server: http://bit.ly/2mbtD6j


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Script 1:
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for xx in `interface Ethernet`; do echo $xx; done

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Script 2:
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 for xx in `interface Ethernet`; do echo $xx `show int $xx | inc input errors` ; done

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Script 3:
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function shrun(){
 n=-1
 while true; do
     let n++
      if [[ $n -le 3 ]]; then
         show run int g0/$n
         echo $n
     else
 break;
     fi
 done
 }