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RobotJohnny's questions

Martin Hope
RobotJohnny
Asked: 2018-08-01 09:26:55 +0800 CST
  • 2

我正在研究一个简单的 bash 脚本，该脚本修复了一个重复的命名问题。

该脚本本身会抓取在 gameslist.xml 文件中多次提及的任何名称，然后将这些名称存储在一个数组中以供以后使用。

我最终在索引中循环这个数组，如下所示：

pi@retropie:~ $ for game in ${game_array[@]:0:10} ; do echo $game; done

它将第一个元素拉到第 10 个元素（即${game_array[9]}），但是输出连接到一行：

pi@retropie:~ $ for game in ${game_array[@]:0:10} ; do echo $game; done
R.B.I. Baseball '94 World Series Baseball '95 Mega Games 1 Bill Walsh College Football T2: The Arcade Game Sonic & Knuckles + Sonic the Hedgehog Sega Top Five Pyramid Magic Tecmo Super Baseball Super Chinese Tycoon

但是，如果我遍历整个数组，它会按预期在新行上输出：

pi@retropie:~ $ for game in ${game_array[@]}; do echo $game; done | head -10
R.B.I. Baseball '94
World Series Baseball '95
Mega Games 1
Bill Walsh College Football
T2: The Arcade Game
Sonic & Knuckles + Sonic the Hedgehog
Sega Top Five
Pyramid Magic
Tecmo Super Baseball
Super Chinese Tycoon

字段分隔符已设置为新行，IFS='$\n'这就是第二个有效的原因，但我一生都无法弄清楚为什么它不适用于第一个？

这是上下文的完整测试脚本：

#!/bin/bash

user_input=$1
while [ -z "$user_input" ]; do
        echo "please enter the name of the system you want to fix the game list for"
        echo "(as it is labelled in /home/pi/RetroPie/roms)"
        read -r user_input
done

ls "/home/pi/RetroPie/roms/$user_input" >/dev/null 2>&1

if  [ "$?" -ne 0 ]; then
        echo "this doesn't appear to be a system installed here. exiting."
        exit 1
fi

games_to_fix()
{
        IFS=$'\n'
        console=$1
        filepath="/opt/retropie/configs/all/emulationstation/gamelists/$console/gamelist.xml"
        game_array=($(fgrep "<name>" "$filepath" | sort | uniq -c | sort -rn | awk  '$1 > 1 {print $0}'| cut -d ">" -f 2 | cut -d "<" -f 1))
        number_to_fix=($(fgrep "<name>" "$filepath" | sort | uniq -c | sort -rn | awk  '$1 > 1 {print $1}'))
}

get_new_name()
{
        mYpath=$1
        new_name=$(echo $mYpath | cut -d ">" -f 2 | cut -d "<" -f 1 | sed -e 's/\.\///g' | sed -e 's/\.7z//g')
}

games_to_fix $user_input

IFS=$'\n'
index=0
for i in ${number_to_fix[@]}; do
        loop=1
        for game in ${game_array[@]:$index:$i}; do
        #       for ind in $(eval echo {1..$i}); do
                line_number=$(fgrep -n "<name>$game</name>"  $filepath | awk '{print $1}' | cut -d : -f 1 | sed -e "${loop}q;d")
                path_line_number=$(expr $line_number - 1 )
                path=$(sed "${path_line_number}q;d" $filepath | cut -d : -f 2)
                get_new_name "$path"
                sed -i "${line_number}s/$game/$new_name/g" $filepath
                ((loop++))
        done
        index=$(expr index + $i);
done
bash shell