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lang-bash
lis not a hex digit, but"\x27df\n"would be treated as"\x27" "df"in busybox awk or mawk but as"\xdf"(0x27dfcast to 8 bit char) in the original awk and gawk (that's the reason why POSIX doesn't specify\xHH). Octals (\047) don't that the same problem and are POSIX. In any case, that assumes an ASCII system (a reasonable assumption these days).