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$ echo abc.def.ghi.jkl.mno | \
  perl -lne 'print join ".", reverse split /\./'
mno.jkl.ghi.def.abc

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$ echo abc.def.ghi.jkl.mno | \
  perl -F'\.' -lpe'$_=join".",reverse@F'
mno.jkl.ghi.def.abc