Now, you can use the powershell-grep function in your PowerShell sessions and scripts. Save the profile file and close the text editor.Add the powershell-grep function to the profile file by copying and pasting the function code into the file. Open the profile file in a text editor by running the following command:.New-Item -ItemType File -Path $profile.CurrentUserAllHosts -Force If the file does not exist, create it by running the following command:.Open PowerShell and run the following command to find the path of your profile file:.To use powershell-grep, you will need to add the function to your PowerShell profile file. The PowerShell-Grep function transforms the input into a string output and then searches for the user-defined pattern using the Select-String cmdlet. This function has been inspired by the Unix/Linux grep command, providing similar functionality within the PowerShell environment. PowerShell-Grep is a unique PowerShell function that allows users to search for a regular expression pattern in text input, all from the convenience of their pipeline. I'm ok with rewriting my approach from line 1 if I can get it done before I go home for the weekend.PowerShell-Grep: Unix/Linux Grep Functionality for Windows PowerShell It's already been running for half an hour. I might be able to break out of the while if the if becomes true but I am still going to make so many comparisons I'm not sure if optimizing that will actually do any good. It's all in memory so at least I don't have disk I/O slowing me down. I'm up for using any tool to speed this up because right now there's 550991 lines in all the log files combined and there's 1830 filenames so this approach is making 1,008,313,530 comparisons. I suppose I could build a large regex of the 1830 files or'd together and run that once against the logs, but is that feasible? The regex would be almost 30KB (1830 files * average length of file name of about 16 chars = 29280 bytes not to mention another 1830 bytes of pipe symbols).Įdit: Here's what I'm doing now when I'm in the logs folder and the list is one folder back: $logs = gc * I have 1830 files in the list so if I have to start fresh with each one, I'll end up reading 46 MB so many times that I'll be dealing with GBs of repeating data. I'm using GnuWin32 on windows so I could couple this with Powershell but I think doing that would require that one filename greps all 46 MB and when I move to the next filename I start over. I'll probably use -A and -B to get a little context out of the log files when a name is found. I know I can cat * all the log files and pipe it to grep. It does contain file names and paths as well as what was done to it. The logs do seem to have a structure, but I'm not entirely familiar with that structure yet. The list is structured as one file per line without file extension. So you'll want to inspect the properties of the objects returned by Get-WinEvent - here using the Where-Object cmdlet: Get-WinEvent -ListLog Where-Object. How could I grep these log files for any value in my list? Pipelines in PowerShell are slightly different from UNIX style shells - instead of passing string output from one command to the next, PowerShell passes raw. In Powershell, how to read and get as fast as possible the last line (or all the lines) which contains a specific string in a huge text file (about 200000 lines / 30 MBytes) I'm using : get-content myfile.txt select-string -pattern 'mystring' -encoding ASCII select -last 1 But it's very very long (about 16-18 seconds). If you really like to use the command grep, then I have a small tip for you. I also have a folder full of 41 log files adding up to 46 MB that hopefully have log entries pertaining to the missing files. The PowerShell grep equivalent Select-String is a great tool to find strings inside text files or other output streams. If you have a bunch of text files in a directory hierarchy, e.g, the Apache configuration files in /etc/apache2/ and you want to find the file where a specific text is defined, then use the -r option of the grep command to do a recursive search. I have a list of files that have gone missing somewhere in our system at work.
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