You can use cat -v or –show-nonprinting options to display ^ and M- notation wherever a non-printable character appears, except for LFD and TAB.
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## adds a non-printing charecter to the file echo -e "Example non-printable charecter: \004" > myfile ## Displays ^ where the non-printing charecter appaers cat -v myfile ## Returns Example non-printable charecter: ^ ## Without any options cat myfile ## Returns Example non-printable charecter: |