Or simpler still

shell> perl -le 'print map chr, qw/84 67 49 67 83 50 79/'
TC1CS2O
[download]

And if you're dealing with hex values

shell> perl -le 'print map { chr hex } qw/54 43 31 43 53 32 4f/'
TC1CS2O
[download]

See. map, chr and hex for more info.
HTH

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broquaint