Which is the command used for displaying the values of a variable into the output console or log?

The command used for displaying the values of a variable into the output console or log - echo
If you want to display a constant string. The below mentioned command can be used
echo <constant string>
ex: echo "The sample message"
If you want to display the value of a variable it can be written like below
echo ${<variable name>>
ex: echo ${var1}
Note: Here var1 is the variable

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