解决粘贴到vim缩进错乱问题

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#!/bin/bash
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if [ $1 ]
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then
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    if [ $1 == "help" ]; then
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        echo -e "\033[37m pay 参数1 [参数2] \033[0m"
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    else
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        if [ $2 ]; then
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            filename = $2
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        fi
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    fi
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else
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    echo -e "\033[37m 缺少关键词，通过'pay help'查看帮助信息 \033[0m"
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fi