Filtering printer motions

• But even in those days, my 13-line C program was not the best way to do this

• It was not even the third-best way:

• 3: with lex:

        %%
        "_\010" { }
        .       { putchar(*yytext); }

• 2: with sed:

       sed -e 's/_\x08//g'    # perl version was   "s/_\cH//g;"

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