WHY

@if(0)==(0) echo off
type 1.txt | cscript //nologo //e:jscript "%~f0" > 2.txt
pause & exit /b
@end

var str = WSH.StdIn.ReadAll();
var reg = /^(\S+)[ \t]+(\d+)/mg;
var obj = {}

while (arr = reg.exec(str)) {
    var key = arr[1];
    var value = 1 * arr[2];
    obj[key] = obj.hasOwnProperty(key) ? obj[key] + value : value;
}
        
for (var key in obj) WSH.Echo(key + ' ' + obj[key]);
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WHY

PowerShell "gc 1.txt | group{($_ -split '\s+')[0]} | forEach{$_.Name + ' ' + ($_.Group -replace '^\S+' | measure -Sum).Sum}" > 2.txt
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WHY

Test.ps1

$arrIn  = [IO.File]::ReadAllLines('1.txt') -match '^\S+\s+\d+';
$arrOut = [Collections.ArrayList]@();
$dict   = New-Object 'System.Collections.Generic.Dictionary[string, Int]';

for ($i = 0; $i -lt $arrIn.Count; $i++) {
    $arr = $arrIn[$i] -split '\s+';
    $key = $arr[0];
    $value = 1 * $arr[1];
    $dict[$key] += $value;
}

forEach ($key In $dict.Keys) {
    [void]$arrOut.Add($key + ' ' + $dict[$key]);
}

[IO.File]::WriteAllLines('2.txt', $arrOut);
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