Analysis of information sources in references of the Wikipedia article "Dd (유닉스)" in Korean language version.
dd was always named after JCL dd cards.
Important note : For some times, dd_rhelp was the only tool (AFAIK) that did this type of job, but since a few years, it is not true anymore: Antonio Diaz did write a ideal replacement for my tool: GNU 'ddrescue'.
