如何查找多个文件，检查重复项并替换为 bash、sed 脚本

Question

I'm looking to have a script, that help me to search the files with help of bash and sed command, that has extension (.bak.alt) and then change the name of the file, if its not already existent. I mean search for (*.bak.alt *.BAK.alt *.bak) and replace it with (*.BAK) if its not already existed and should compare the new one after changing it with the old one and then react, if its the same content and name, do nothing, if not then change it.

i have figure something with help of a friend but its not complete.

#!/bin/bash

        echo " Finds something.."

        find . -type f \( -name "*.bak.alt" \) > F1.txt
        cat F1.txt
        find . -type f \( -name "*.BAK.alt" \)> F2.txt
        cat F2.txt

        if diff F1.txt F2.txt
                then echo "everythings looks good":
        else
              sed -E 's/^\(.*)\.(bak|BAK)\.alt$/mv "&" "\1.BAK"/;e'| wc -l    echo " Files changed "
fi

Answer 1

Something like this (untested) is what you need:

#!/usr/bin/env bash
shopt -s nocasematch

while IFS= read -r old; do
    new="${old/%.alt}"
    new="${new/%.bak}"
    [[ ! -e "$new" ]] && echo mv -- "$old" "$new"
done < <( find . -type f \( -name '*.bak.alt' -o -name '*.BAK.alt' -o -name '*.bak' \) )

Remove the echo when you're done testing and want it to actually do the mv .