Extracting columns from text file using Perl one-liner: similar to Unix cut


Question

I'm using Windows, and I would like to extract certain columns from a text file using a Perl, Python, batch etc. one-liner.

On Unix I could do this:

cut -d " " -f 1-3 <my file>

How can I do this on Windows?

1
9
3/23/2010 12:42:27 PM

Accepted Answer

Here is a Perl one-liner to print the first 3 whitespace-delimited columns of a file. This can be run on Windows (or Unix). Refer to perlrun.

perl -ane "print qq(@F[0..2]\n)" file.txt
10
3/23/2010 12:41:35 PM

you can download GNU windows and use your normal cut/awk etc.. Or natively, you can use vbscript

Set objFS = CreateObject("Scripting.FileSystemObject")
Set objArgs = WScript.Arguments
strFile = objArgs(0)
Set objFile = objFS.OpenTextFile(strFile)
Do Until objFile.AtEndOfLine
    strLine=objFile.ReadLine
    sp = Split(strLine," ")
    s=""
    For i=0 To 2
        s=s&" "&sp(i)       
    Next
    WScript.Echo s
Loop

save the above as mysplit.vbs and on command line

c:\test> cscript //nologo mysplit.vbs file

Or just simple batch

@echo off
for /f "tokens=1,2,3 delims= " %%a in (file) do (echo %%a %%b %%c)

If you want a Python one liner

c:\test> type file|python -c "import sys; print [' '.join(i.split()[:3]) for i in sys.stdin.readlines()]"

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