gawk: Printf

 
 5.5 Using 'printf' Statements for Fancier Printing
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 For more precise control over the output format than what is provided by
 'print', use 'printf'.  With 'printf' you can specify the width to use
 for each item, as well as various formatting choices for numbers (such
 as what output base to use, whether to print an exponent, whether to
 print a sign, and how many digits to print after the decimal point).
 

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