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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Monitoring response time with curl

   curl -s -o /dev/null -w "Conecction: %{time_connect}s | Start transfer: %{time_starttransfer}s | Total time: %{time_total}s\n" ...

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