[librasteve]

or

  raku -e 'say "etbjxntqrdke".comb.map({chr .ord + 1}).join'

[lizmat]

or

raku -e 'say "etbjxntqrdke".comb.map(*.succ).join'

[srejk]

This is just a ROT1, so perl -pe'y/a-z/b-za/'<<<etbjxntqrdke

[forinti]

That makes for a cool rot13: /a-z/n-za-m/

[librasteve]

raku -pe 'tr/a..z/b..za/' <<< etbjxntqrdke