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You can use perl's pack function to do that

$hex_ascii=%20;
print "HEX $hex_ascii\n";
$hex_ascii =~ s/%(..)/pack("c",hex($1))/ge;
print "Alpha $hex_ascii\n";

Code above may not suit exactly...

Hey There,

I don't believe it's possible in grep, but you can do it pretty simply using egrep - with your example:

cat data|cut -f1|egrep '[0-9]|[1-7][0-5]'

I may be wrong about...

Hey there,

Also, what's the "command" that's being run? That may be an issue.

If you're running the command manually, are you running it from a remote terminal or a local console? ...