xkcd://208: Regular Expressions to the rescue. 
perl -pi -e 's/^(.{17})(.{6})(.{31})(.{3})(.{3})/$1\t$2\t$3\t$4\t$5\t/
+' file.txt

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#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: Adding a TAB after a certain ammount of characters by kennethk
in thread Adding a TAB after a certain ammount of characters by biancoari

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