sum the odd numbers in line form file.txt bash - bash

Question

hello the StackOverflow i wanted to ask you how to sum the odd numbers in every line from input file.txt
the input.txt file looks like that
4 1 8 3 7
2 5 8 2 7
4 7 2 5 2
0 2 5 3 5
3 6 3 1 6
the output must be
11
12
12
13
7
start of the code like this
read -p "Enter file name:" filename
while read line
do
...
my code whats the wrong here
#!/bin/sh
read -p "Enter file name:" filename
while read line
do
sum = 0
if ($_ % 2 -nq 0){
sum = sum + $_
}
echo $sum
sum = 0
done <$filename

Answer 1

The logic seems correct in your question, so I'll go with you're not sure how to do this line by line as stated on your comment.
if ($_ % 2 -nq 0){
sum = sum + $_
}
I think it's a good place for a function in this case. Takes a string containing integers as input and returns the sum of all odd numbers on that string or -1 assuming there are no integers or all even numbers.
function Sum-OddNumbers {
[cmdletbinding()]
param(
[parameter(mandatory,ValueFromPipeline)]
[string]$Line
)
process {
[regex]::Matches($Line,'\d+').Value.ForEach{
begin {
$result = 0
}
process {
if($_ % 2) {
$result += $_
}
}
end {
if(-not $result) {
return -1
}
return $result
}
}
}
}
Usage
#'
4 1 8 3 7
2 5 8 2 7
4 7 2 5 2
0 2 5 3 5
3 6 3 1 6
2 4 6 8 10
asd asd asd
'# -split '\r?\n' | Sum-OddNumbers
Result
11
12
12
13
7
-1
-1

Answer 2

If that's how your txt file is set up, you can use Get-Content and a bit of logic to accomplish this.
Get-Content will read the file line by line (unless -Raw is specified), which we can pipe to a Foreach-Object to have the current line in the iteration split by the white space.
Then, we can evaluate the newly formed array (due to splitting the white space, leaving the numbers to create an array).
Finally, just get the sum of the odd numbers.
Get-Content -Path .\input.txt | ForEach-Object {
# Split the current line into an array of just #'s
$OddNumbers = $_.Split(' ').Trim() | Foreach {
if ($_ % 2 -eq 1) { $_ } # odd number filter
}
# Add the filtered results
($OddNumbers | Measure-Object -Sum).Sum
}

Answer 3

"what's wrong here":
while read line
do
sum = 0
if ($_ % 2 -nq 0){
sum = sum + $_
}
echo $sum
sum = 0
done <$filename
First, in sh, spaces are not allowed around the = in an assigmnent
Next the if syntax is wrong. See https://www.gnu.org/software/bash/manual/bash.html#index-if
See also https://www.gnu.org/software/bash/manual/bash.html#Shell-Arithmetic