I am not sure what exactly you mean by ascii to hex and oct. Are you talking about converting a string representation like "0755" or "0x55" ? If yes, then look at oct and hex.

Otherwise maybe you want to get the ascii value of a character and represent it as oct or hex. Use ord to get the ascii value and then printf %o for oct and printf %x for hex. The formatting codes for printf are explained here

Update:

After re-reading the link you included I think I have a better understanding of what you are asking for. Some code below

octal

hex

<cite>Just a tongue-tied, twisted, earth-bound misfit. -- Pink Floyd</cite>

o = Octal integer
x = Hexadecimal integer
:(

~Particle ;Þ

my @hex = unpack ("h*", $ascii_string);

foreach my $hex (@hex)
{
     printf ("%c", hex ($hex));
}
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my $char = 'm';

my $octal = sprintf("%03o", ord($char));
my $hex = sprintf("%02X", ord($char));

print "Oktal: $octal\tHex: $hex\n";
[download]

Best regards,
perl -le "s==*F=e=>y~\*martinF~stronat~=>s~[^\w]~~g=>chop,print"