15.3. Single quotes
The single quote is very similar to the double quote except it tells the shell to ignore any type of value evaluation; in other words, to treat everything inside the quotes as if it was disabling its special meaning – a case of what you type between the single quotes is what you get. Using the sample example as in the double quote:
$ GIRL='girl'
$ echo "The '$GIRL' did well"
The 'girl' did well
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