How to use shell to implement conversion output

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A simple conversion output shell script, input from the healthy disk in the format of a _ is output as follows

A

C

The code is as follows:

#! / bin/bash

Read-p 'Please enter:'

Echo $REPLY > .tmp5

Count= `grep-o', '.tmp5 | wc-l`

Echo $count

Count_=$ ((count+1))

I, 1

: > .tmp1

While [$I-le $count_]

Do

Echo $I

Awk-F,-v j = "$I"'{print$j} '.tmp5

ITunes $((iTun1))

Done

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