Shell finishing (38) = = = Caesar encryption and decryption

The implementation is as shown in the following:

[Email protected] shell]# bash zong.sh

================== Caesar encryption and decryption ==============================

1) input string for Caesar encryption (the input string can only be letters, numbers, spaces)

2) decrypted with encrypted string

3) exit

Input:q

The shell code is as follows:

#!/bin/bashjiami () {        echo {a: Z} | xargs -n1 >file        echo {a. Z} {a. z}  @ @  | xargs -n1 >>file         read -p  "Input:"  num        num1= ' echo   $num  |sed  ' s/ /@/g '  | tr  ' 0-9 '   ' a-j '          a=${#num1}        for i in  ' seq  $a '         do                  q= ' echo  $num 1 | cut -c  $i '                   w= ' Cat -n  file | awk  '/' $q '/'  | head -1|awk  ' {print $1} '                   w=$ (($w + 1))                   d= ' cat file | sed -n  ' $w ' P '                   echo -n   "$d"         done         Echo}jiemi () {         echo {a: Z} | xargs -n1 >file        echo {a. Z} {a. Z} {a. z} @ @ | xargs -n1 >>file         read -p  "Input:"  num        num1= ' echo  $num  | sed  ' s/@/@/g ' &NBSP;&NBSP;&Nbsp;     a=${#num1}        for i in   ' seq  $a '         do                 q= ' echo  $num 1 | cut -c  $i '                 w= ' cat - n file | awk  '/' $q '/'  | tail -1|awk  ' {print $1} '                  w=$ (($w-1))                  d= ' cat file |  sed -n  ' $w ' P '                  v= ' echo -n  ' $d '                  echo -n  $v  | sed  ' s/@/ /g '  | tr  ' a-j '   ' 0-9 '          done        echo}together () {case    $choice  in        1)                  jiami                 ;; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;2)                  jiemi                 ;; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;3)                  exit 0                 ;;         *)       exit 0                 ;; esac}while :d ocat << eof================== Caesar encryption and decryption ==============================         1) input string for Caesar encryption (the input string can only be letters, numbers, spaces)       &NBSP;&NBSP;&NBSP;2) The encrypted string is decrypted         3) exit eof         read -p  "INPUT:"  choice         together        echodone

The implementation results are as follows:

================== Caesar encryption and decryption ==============================

1) input string for Caesar encryption (the input string can only be letters, numbers, spaces)

2) decrypted with encrypted string

3) exit

Input:1

Input:a 123b

[Email protected]

================== Caesar encryption and decryption ==============================

1) input string for Caesar encryption (the input string can only be letters, numbers, spaces)

2) decrypted with encrypted string

3) exit

Input:2

Input:[email protected]

A 123b

This article is from the "It Life" blog, so be sure to keep this source http://dingxue.blog.51cto.com/12290895/1972182

Shell finishing (38) = = = Caesar encryption and decryption