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mug896 Permalink
December 30, 2013, 01:30

how about this one for IPv4 check

awk -F '[.]' 'function ok(n) {
if (n ~ /^[0-9][0-9]?[0-9]?$/) {
return (n>=0 && n<=255)
}
}
{exit (ok($1) && ok($2) && ok($3) && ok($4))}'

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