Word Quiz Helper

This is a program to:

Find anagrams

find_anagrams computer
cup metro
...

Find words of given length within given letters

./find_by_letters 4 feburary
barf
free
fear
...

Hide a secret message from evil teachers

./secret_code 1-letter encode abc # -> bcd
./secret_code 1-letter decode bcd # -> abc

./secret_code symbol encode "do not show this to a teacher" # -> $0 /05 4)08 5)*4 50 ! 5%!#)%3
./secret_code symbol decode '$0 /05 4)08 5)*4 50 ! 5%!#)%3' # -> do not show this to a teacher