Convert to upper or lower case in shell

convert string to upper or lower case in shell script

convert string to upper case
echo aBcD | tr '[:lower:]' '[:upper:]'

convert string to lower case
echo aBcD | tr '[:upper:]' '[:lower:]'
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How to list open ports and application using them in Windows

  netstat -abn or netstat -a -n -p tcp -o

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