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You can probably use a shell for this task:
for folder in folder* ; do [ -f $folder/abc.txt ] && mv $folder/abc.txt $folder/$folder.txt done

In Perl, the solution is quite similar:

for my $folder (glob 'folder*') { # or (grep -d, glob 'folder*') rename "$folder/abc.txt", "$folder/$folder.txt" if -f "$folder/abc +.txt"; }

(Untested)

لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Rename multiple files following their directories' name by choroba
in thread Rename multiple files following their directories' name by pi3142

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