echo -n 5a | perl -pe 's/([0-9a-f]{2})/chr hex $1/gie'

请注意，这不会跳过非十六进制字符.如果您只想要十六进制(原始字符串中没有空格等):

Note that this won't skip non-hex characters. If you want just the hex (no whitespace from the original string etc):

echo 5a | perl -ne 's/([0-9a-f]{2})/print chr hex $1/gie'

此外，zsh 和 bash 在 echo 中原生支持:

Also, zsh and bash support this natively in echo:

echo -e 'x5a'