Thank you for your response. I've just tested the suggestion from the superuser.com answer. To be honest, without your explanation that answer doesn't give much clues. Simply compare it.

As I have already said, the code page defaults to 866 (or IBM CP866, the old code page since MSDOS 4.01). BodyName = koi8-r is another code page 20866. How does it indeed work -- I don't know, cmd.exe is definitely painful. 
C:\>chcp
Active code page: 866

C:\>powershell -c "[System.Text.Encoding]::Default"


IsSingleByte      : True
BodyName          : koi8-r
EncodingName      : Cyrillic (Windows)
HeaderName        : windows-1251
WebName           : windows-1251
WindowsCodePage   : 1251
IsBrowserDisplay  : True
IsBrowserSave     : True
IsMailNewsDisplay : True
IsMailNewsSave    : True
EncoderFallback   : System.Text.InternalEncoderBestFitFallback
DecoderFallback   : System.Text.InternalDecoderBestFitFallback
IsReadOnly        : True
CodePage          : 1251

[download]
I tested the command from my opening post with different codes pages, setting it to 1251 or 65001 (utf-8). The only correct encoding for Cyrillic text in CLI is 1251. The default encoding in Cygwin is en_US.UTF-8.

Updated:

I tested the script invoking it from the shell/batch script. It works correctly, if the title's encoding corresponds the encoding of the shell script. The code page 1251 only has to be specified in the batch script, independently of the encoding of the batch script itself.

In reply to Re^2: Perl, DOS and encodings by siberia-man
in thread Perl, DOS and encodings by siberia-man

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.