Comments on: PowerShell Get Content http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#utm_source=feed&utm_medium=feed&utm_campaign=feed?utm_source=rss&utm_medium=rss&utm_campaign=powershell-get-content Advice, solutions, tips and more for the lonely Windows administrator with too much to do and not enough time. Tue, 07 Feb 2012 16:20:17 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Jeffery Hicks http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-100 Jeffery Hicks Thu, 23 Jul 2009 14:19:12 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-100 I just ran <br /><br />PS C:\windows> (gc .\WindowsUpdate.log)[-10..-1]<br /><br />In PowerShell v2 on a log file with 16511 lines and it took hardly any time at all to grab the last 10 lines. I just ran

PS C:\windows> (gc .\WindowsUpdate.log)[-10..-1]

In PowerShell v2 on a log file with 16511 lines and it took hardly any time at all to grab the last 10 lines.

]]> By: Jeffery Hicks http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-99 Jeffery Hicks Thu, 23 Jul 2009 14:15:40 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-99 You might wait and try using the version of Get-Content in PowerShell v2.0. Performance with large text files is always an issue. You might wait and try using the version of Get-Content in PowerShell v2.0. Performance with large text files is always an issue.

]]> By: Anonymous http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-98 Anonymous Thu, 23 Jul 2009 02:55:32 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-98 I'm just trying to find Linux equivalents for PS to work on our big log files on Windows and its true, the PS commands are taking about 3 minutes to get a result back which is not acceptable for me. Hope that there is another solution to read the file from the end instead of reading the whole file.<br /><br />Any ideas yet?<br />Thanks. I'm just trying to find Linux equivalents for PS to work on our big log files on Windows and its true, the PS commands are taking about 3 minutes to get a result back which is not acceptable for me. Hope that there is another solution to read the file from the end instead of reading the whole file.

Any ideas yet?
Thanks.

]]> By: Anonymous http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-88 Anonymous Mon, 02 Mar 2009 21:31:00 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-88 Unlike tail, which I believe reads the file in reverse n number of lines, using [-n..-m] or | select -last n seems to require PS to read the entire file and then just return what you've selected. Try using either of the proposed PS techniques to "tail" a 300 MB file. It takes five minutes, compared to 5 seconds with tail. <br/><br/>For a tail equivalent, PS would need to filter the input, not the output. Unlike tail, which I believe reads the file in reverse n number of lines, using [-n..-m] or | select -last n seems to require PS to read the entire file and then just return what you’ve selected. Try using either of the proposed PS techniques to “tail” a 300 MB file. It takes five minutes, compared to 5 seconds with tail.

For a tail equivalent, PS would need to filter the input, not the output.

]]> By: Jeffery Hicks http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-30 Jeffery Hicks Fri, 16 Feb 2007 01:28:00 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-30 I must have had fumbled fingers the first time I tried your suggestion because it didn't work for me. Maybe I missed the minus signs. But I see now what you are talking about.<br/><br/>Thanks. I must have had fumbled fingers the first time I tried your suggestion because it didn’t work for me. Maybe I missed the minus signs. But I see now what you are talking about.

Thanks.

]]> By: Vinicius Canto http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-29 Vinicius Canto Fri, 16 Feb 2007 00:39:00 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-29 Yeah, great...<br/><br/>But my recommendation works even when you don't know de lenght of the file. If you use an invalid interval (like use [-4000..-1] with a file with only four lines, the command still works.<br/><br/>By curiosity, I found on the Internet the legend, the original Tail command, but for Windows!<br/>http://tailforwin32.sourceforge.net/<br/><br/>I haven't tested yet, but I liked.<br/><br/>Congratulations for you blog... it's very good. It's in my blog list now!<br/><br/>Vinicius Yeah, great…

But my recommendation works even when you don’t know de lenght of the file. If you use an invalid interval (like use [-4000..-1] with a file with only four lines, the command still works.

By curiosity, I found on the Internet the legend, the original Tail command, but for Windows!
http://tailforwin32.sourceforge.net/

I haven’t tested yet, but I liked.

Congratulations for you blog… it’s very good. It’s in my blog list now!

Vinicius

]]> By: Jeffery Hicks http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-28 Jeffery Hicks Thu, 15 Feb 2007 11:36:00 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-28 Using the alias, cat, certainly makes it easier. Just as a point of reference, I try to avoid using aliases so that people understand what cmdlet is really doing the work.<br/><br/>Your comment certainly works if you know the length of the file. I also should have pointed out that you can use:<br/><br/>cat c:\boot.ini -totalcount 3<br/><br/>and that will return the first 3 lines. -1 means return everything so you can use that to get the end of the file. But certainly a handy HEAD subsitute. Using the alias, cat, certainly makes it easier. Just as a point of reference, I try to avoid using aliases so that people understand what cmdlet is really doing the work.

Your comment certainly works if you know the length of the file. I also should have pointed out that you can use:

cat c:\boot.ini -totalcount 3

and that will return the first 3 lines. -1 means return everything so you can use that to get the end of the file. But certainly a handy HEAD subsitute.

]]> By: Vinicius Canto http://jdhitsolutions.com/blog/2007/02/powershell-get-content/#comment-27 Vinicius Canto Wed, 14 Feb 2007 23:05:00 +0000 http://jdhitsolutions.com/blog/2007/02/13/powershell-get-content/#comment-27 Hi,<br/><br/>I have posted another solution (and some comments) about the last command, to show only the last 5 lines of a file...<br/><br/>Instead of<br/><br/>$c=get-content c:\boot.ini;$l=$c.length;$c[($l-5)..$l]<br/><br/>you can use<br/><br/>(cat c:\boot.ini)[-5..-1]<br/><br/>The only problem is... my blog is in Portuguese. There are few content about Powershell and scripting in my country...<br/><br/>If you have some time:<br/>http://viniciuscanto.blogspot.com/2007/02/tail-x-get-content-obtendo-as-ltimas.html<br/><br/><br/>Tks!<br/><br/>--<br/>Vinicius Canto < scripterbr_at_gmail_dot_com ><br/>MVP Visual Developer - Scripting<br/>MCP Windows 2000 Server, Windows XP e SQL Server 2000<br/>Blog sobre Scripting: http://viniciuscanto.blogspot.com Hi,

I have posted another solution (and some comments) about the last command, to show only the last 5 lines of a file…

Instead of

$c=get-content c:\boot.ini;$l=$c.length;$c[($l-5)..$l]

you can use

(cat c:\boot.ini)[-5..-1]

The only problem is… my blog is in Portuguese. There are few content about Powershell and scripting in my country…

If you have some time:
http://viniciuscanto.blogspot.com/2007/02/tail-x-get-content-obtendo-as-ltimas.html

Tks!

–
Vinicius Canto < scripterbr_at_gmail_dot_com >
MVP Visual Developer – Scripting
MCP Windows 2000 Server, Windows XP e SQL Server 2000
Blog sobre Scripting: http://viniciuscanto.blogspot.com

]]>