$RT_DiffFiles= `comm -23 <(sort $RT_64OG_FilesPath) <(sort $RT_64_FilesPath)`;

##</code><code>##

sh: -c: line 0: syntax error near unexpected token `('
sh: -c: line 0: `comm -23 <(sort ./TmpData/RT_64OG_Files) <(sort ./TmpData/RT_64_Files)'

##</code><code>##

comm -23 <(sort ./TmpData/RT_64OG_Files) <(sort ./TmpData/RT_64_Files)