<# :
@echo off
PowerShell -NoProfile -C ". ([ScriptBlock]::Create((gc -Literal '%~f0') -join \"`r`n\"))"
pause & exit/b
#>

$path1 = 'D:\DATA1\';  #源目录
$path2 = 'D:\DATA2\';  #目标目录

if( -Not [IO.Directory]::Exists($path2) ){ $null = md $path2; }

forEach( $file In (dir -Literal $path1 -Filter *.txt) ){
    $dic = New-Object 'System.Collections.Generic.Dictionary[string, [Collections.ArrayList]]';
    $res = [Collections.ArrayList]@();

    forEach( $strLine In [IO.File]::ReadAllLines($file.FullName, [Text.Encoding]::UTF8) ){
        $arr = $strLine -split '->';
        if( $arr.Count -eq 2 ){
            $key = $arr[0].ToLower();
            if( -Not $dic.ContainsKey($key) ){
                $dic.Add( $key, @($strLine) );
            }else{
                [void]$dic[$key].Add( $arr[1] );
            }
        }
    }

    forEach( $key In $dic.Keys ){
        [void]$res.Add( $dic[$key] -join ' ' );
    }

    [IO.File]::WriteAllLines( $path2 + $file.Name, $res, [Text.Encoding]::UTF8 );
}
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A->甲
A->甲2
B->乙
B->乙2
C->丙
C->丙2
D->丁
D->丁2
E->戊
E->戊2
F->己
F->己2
G->庚
G->庚2
H->辛
H->辛2
I->壬
I->壬2
J->癸
J->癸2
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gawk -F"->" "{a[$1]=a[$1]?a[$1]\" \"$2:$2}END{for (id in a)print id FS a[id]}" 1.txt>2.txt
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A->甲 甲2
B->乙 乙2
C->丙 丙2
D->丁 丁2
E->戊 戊2
F->己 己2
G->庚 庚2
H->辛 辛2
I->壬 壬2
J->癸 癸2
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 [IO.File]::ReadAllLines($file.FullName, [Text.Encoding]::UTF8)|
    group { $_.split('->')[0]+'->' }|%{
        $f = $_
        $s = $($f.Group | % { $_.split('->')[-1] }) -join ' '
        $f.Name + $s
}
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var path1 = 'D:\\Data1\\';     //源文件路径
var path2 = 'D:\\Data2\\';     //目标文件路径

var getText = function(file){
    var ado = new ActiveXObject('Adodb.Stream');
    ado.Type = 2;
    ado.CharSet = 'UTF-8';
    ado.Open();
    ado.LoadFromFile(file);
    var text = ado.ReadText(-1);
    ado.Close();
    return text;
}

var saveFile = function(file){
    var ado = new ActiveXObject('Adodb.Stream');
    ado.Type = 2;
    ado.CharSet = 'UTF-8';
    ado.Open();
    ado.WriteText(out.join('\r\n'));
    ado.SaveToFile(file, 2);
    ado.Close();
}

var fso = new ActiveXObject('Scripting.FileSystemObject');
if( !fso.FolderExists(path2) ) fso.CreateFolder(path2);

var e = new Enumerator( fso.GetFolder(path1).Files );
var reg = /^((?:(?!->)\S)+)->(\S+)(?=\r\n|$)/mg;

for(; !e.atEnd(); e.moveNext()){
    if( !/\.txt$/i.test(e.item().Name) ) continue;
    var map = {};
    var out = [];
    var str = getText( e.item().Path );
    while( arr = reg.exec(str) ){
        var key = arr[1].toLowerCase();
        map[key] = map.hasOwnProperty(key) ? map[key] + ' ' + arr[2] : arr[0];
    }
    for( var key in map ) out.push(map[key]);
    saveFile( path2 + e.item().Name );
}

WSH.Echo('Done');
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@echo off
md "D:\Data2\" 2>nul
PowerShell "dir 'D:\Data1\' -Filter *.txt | forEach{(gc $_.FullName -Enc UTF8) -match '->' | group{($_ -split '->')[0]} | forEach{$_.Name + '->' + ($_.Group -replace '^(?:(?!->).)*->' -join ' ')} | sc ('D:\Data2\' + $_.Name) -Enc UTF8}"
pause
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gawk -F"->" "{a[$1]=a[$1]?a[$1]\" \"$2:$2}END{for (id in a)print id FS a[id]}" 1.txt>2.txt
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gawk -F"->" "!(($1 $2) in T) {T[$1 $2];a[$1]=a[$1]?a[$1]\" \"$2:$2}END{for (id in a)print id FS a[id]}" 1.txt>3.txt
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