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One of the ways to get number of lines from a file is this method in PowerShell:
PS C:\Users\Pranav\Desktop\PS_Test_Scripts> $a=Get-Content .\sub.ps1 PS C:\Users\Pranav\Desktop\PS_Test_Scripts> $a.count 34 PS C:\Users\Pranav\Desktop\PS_Test_Scripts> However, when I have a large 800 MB text file, how do I get the line number from it without reading the whole file?
The above method will consume too much RAM resulting in crashing the script or taking too long to complete.
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To count the total number of lines in the file in PowerShell, you first need to retrieve the content of the item using Get-Content cmdlet and need to use method Length() to retrieve the total number of lines.
wc command - The wc (word count) command is one of the easiest and fastest methods of getting the amount of characters, lines, and words in a file.
The wc command is used to find the number of lines, characters, words, and bytes of a file. To find the number of lines using wc, we add the -l option. This will give us the total number of lines and the name of the file.
You can use Measure-Object to count objects or count objects with a specified Property. You can also use Measure-Object to calculate the Minimum, Maximum, Sum, StandardDeviation and Average of numeric values. For String objects, you can also use Measure-Object to count the number of lines, words, and characters.
Use Get-Content -Read $nLinesAtTime to read your file part by part:
$nlines = 0; # Read file by 1000 lines at a time gc $YOURFILE -read 1000 | % { $nlines += $_.Length }; [string]::Format("{0} has {1} lines", $YOURFILE, $nlines) And here is simple, but slow script to validate work on a small file:
gc $YOURFILE | Measure-Object -Line If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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