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douglasnaphas/awk_print_A-Z

Created August 6, 2015 23:02
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Why does awk print letters not between A and Z in the ASCII character set when told to print lines that match the regex [A-Z]?
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awk_print_A-Z
$ echo "b" | awk '/[A-Z]/'
b
$ echo "a" | awk '/[A-Z]/'
$ echo "z" | awk '/[A-Z]/'
z
$
@jrosen
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jrosen commented Aug 6, 2015

Wait. I misread. Nevermind

@sgoguen
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sgoguen commented Aug 7, 2015

Sorry, I can't get this to reproduce on my machine. My awk (the default ubuntu docker image) is case sensitive by default. When I force case sensitivity:

echo "a" | awk 'IGNORECASE = 1;/[A-Z/'

I get the correct output.

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