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#!/bin/bash

    selection=
    until [ "$selection" = "0"]; do
     echo ""
     echo "PROGRAM MENU"
     echo "1 - Encrypt text with Rot13"
     echo "2 - DEcrypt text with Rot13"
     echo ""
     echo "0 - Exit program"
     echo ""
     echo -n "Enter Selection:"
     read selection
     echo ""
     case $selection in
         1 ) echo "Line to be encrypted"
         rot13 "a-z"
         2 ) echo "Line to be decrypted"
         rot13 "n-za-m"
         3 ) exit;;
         * ) echo "Please enter 1,2, or 0"
     esac
done

.txt ファイルを読み取り、暗号化して保存し、その後復号化したいと考えています。

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