tr replaces character by character. If you want to replace _all_ = with blanks you could use 
tr/=/ /;

[download]
If you want to delete them you use 
tr/=//d;

[download]
If you want to delete last = in a string you could do it with s/// instead like in 
s/=\s*$//;

[download]
that matches a = followed by nothing or whitespace and replaces it with nothing. /t0mas

In reply to RE: Transliteration by t0mas
in thread Transliteration by cei

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