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copied!<p>This is actually pretty easy in <a href="http://en.wikipedia.org/wiki/Windows_PowerShell" rel="nofollow noreferrer">PowerShell</a>:</p> <pre><code>function Number-Lines($name) { Get-Content $name | ForEach-Object { $i = 1 } { "{0:000}. {1}" -f $i++,$_ } } </code></pre> <p>What I'm doing here is getting the contents of the file, this will return a <code>String[]</code>, over which I iterate with <code>ForEach-Object</code> and apply a format string using the <code>-f</code> operator. The result just drops out of the pipeline as another <code>String[]</code> which can be redirected to a file if needed.</p> <p>You can shorten it a little by using aliases:</p> <pre><code>gc .\someFile.txt | %{$i=1}{ "{0:000}. {1}" -f $i++,$_ } </code></pre> <p>but I won't recommend that for a function definition.</p> <p>You way want to consider using two passes, though and constructing the format string on the fly to accommodate for larger numbers of lines. If there are 1500 lines <code>{0:000}</code> it won't be sufficient anymore to get neatly aligned output.</p> <p>As for which language is best for such tasks, you might look at factors such as</p> <ul> <li>conciseness of code (Perl will be hard to beat there, especially that one-liner in another answer)</li> <li>readability and maintainability of code</li> <li>availability of the tools (Perl and Python aren't installed on Windows by default (PowerShell only since Windows 7), so deployment might be hindered.)</li> </ul> <p>In the light of the last point you might even be better off using <code>cmd</code> for this task. The code is similarly pretty simple:</p> <pre><code>@echo off setlocal set line=1 for /f "delims=" %%l in (%1) do call :process %%l endlocal goto :eof :process call :lz %line% echo %lz%. %* set /a line+=1 goto :eof :lz if %1 LSS 10 set lz=00%1&goto :eof if %1 LSS 100 set lz=0%1&goto :eof set lz=%1&goto :eof goto :eof </code></pre> <p>That assumes, of course, that it has to run somewhere else than your own machine. If not, then use whatever fits your needs :-)</p>

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