usage.txt

Usage is "(path to script)" "file" mode password, example of usage :
"~/Desktop/aes256.sh" "file.txt" enc password
Where ~/Desktop is the path to AES256.sh, file.txt is the file to encrypt/decrypt, enc is the mode(can be enc(for encrypt) or dec(for decrypt), and password is the password to encrypt/decrypt the file with.
It's recommended to quote all file paths or there will occour problems when either of the two paths contains spaces.