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alp

Or what I've found but never used myself is setting the filemode to binary with binmode()

This lines should be added at the beginning of your Perl script:

binmode(STDIN, ':crlf');

binmode(STDOUT, ':crlf');

binmode(STDERR, ':crlf');

ev3-blog 11mo ago

after a long troubleshooting, I finally understands what went wrong

This is how I created the pwd.txt file

echo "abcde" > pwd.txt

and by doing so, it generated a UTF-16 encoded file, which has the annoying habit of having invisible characters added to it at the beginning and in between the characters as well ...

Windows stuffs

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ev3-blog 11mo ago

I realized all this because of the use of 'echo' in the Windows terminal

once I used Perl to write the pwd.txt file, everything went fine ... no surprise, no added extra characters

the file generated by the echo command had a BOM invisible character at the start, FF FE and 00 every second character because UTF-16 requires two code units to represent a single character.

surprise, surprise

alp 11mo ago

I see, encoding issues.