如何从powershell中的.txt文件中获取一行的总和？

Question

So, I have a textfile "numbers.txt" like this:

2 3 4 5
5 6
6 7 7
6 88 9 67 4
65 76 979 8
6 88 5 4 23

My question is, how can i get the sum of each line? What i tried to do:

$data=Get-Content -Delimiter " " numbers.txt
$data | % {
 $sum=0
 foreach($num in $_) {
 $sum+=$num
 }
 Write-Host $sum
 }

But it gives back weird numbers. I dont know how to separate the different numbers in each line and get the sum of them.

Answer 1

Here's a fast and concise PSv4+ solution that utilizes LINQ:

(Get-Content numbers.txt).ForEach({ 
  [Linq.Enumerable]::Sum([int[]] ($_ -split ' ')) 
})

• (Get-Content numbers.txt) returns the input file's lines as an array of strings.

• .ForEach({ ... } ) executes a script block ( { ...} ) for each input line.

  • [Linq.Enumerable]::Sum(...) sums the elements of an array (enumerable) of numbers.

  • $_ -split ' ' splits the input line at hand ( $_ ) into (string) tokens by spaces, and converts the result to an array of integers ( [int[]] ).

Here's a - slower - solution closer to what you attempted (works in PSv3- too):

Get-Content numbers.txt | ForEach-Object {  # Process each line.
  $sum = 0 # initialize the sum (implicitly of type [int])
  foreach ($num in $_ -split ' ') { # Process all tokens on the line.
    # Note: Because $sum is [int]-typed, adding the *string* token at 
    #       hand implicitly converts it to [int].
    $sum += $num  
  }
  $sum # Output the sum - do NOT use Write-Host to output DATA
}

Both solutions yield the following:

14     # 2 + 3 + 4 + 5
11     # 5 + 6
20     # ...
174
1128
126

---

As for what you tried :

Get-Content -Delimiter " " numbers.txt

This splits your entire file into a single array of number strings, ignoring line boundaries.

Instead, you must use Get-Content as-is in order to process the file line by line , and then split each line into space-separated tokens to sum up.

Answer 2

Turn it into a single array of numbers:

-split (get-content numbers.txt) | measure -sum | % sum

1473

Oops, sum each line:

get-content numbers.txt | foreach { -split $_ | measure -sum } | foreach sum

14
11
20
174
1128
126