Loop through files in a directory using PowerShell

Question

How can I change the following code to look at all the  log files in the directory and not just the one file   I need to loop through all the files and delete all lines that do not contain  step4  or  step9   Currently this will create a new file  but I m not sure how to use the for each loop here  newbie    The actual files are named like this  2013 09 03 00 01 29 log  I d like the output files to either overwrite them  or to have the SAME name  appended with  out     In    C  Users gerhardl Documents My Received Files Test In log   Out    C  Users gerhardl Documents My Received Files Test Out log   Files    C  Users gerhardl Documents My Received Files    Get-Content  In   Where-Object     -match  step4  -or    -match  step9       Set-Content  Out

User · Accepted Answer

Give this a try   Get-ChildItem  C  Users gerhardl Documents My Received Files  -Filter   log    Foreach-Object        content   Get-Content    FullName       filter and save content to the original file      content   Where-Object     -match  step 49      Set-Content    FullName       filter and save content to a new file       content   Where-Object     -match  step 49      Set-Content     BaseName     out log

User · Answer

To get the content of a directory you can use   files   Get-ChildItem  C  Users gerhardl Documents My Received Files     Then you can loop over this variable as well   for   i 0   i -lt  files Count   i           outfile    files  i  FullName    out       Get-Content  files  i  FullName   Where-Object       -match  step4  -or    -match  step9       Set-Content  outfile     An even easier way to put this is the foreach loop  thanks to  Soapy and  MarkSchultheiss    foreach   f in  files        outfile    f FullName    out       Get-Content  f FullName   Where-Object       -match  step4  -or    -match  step9       Set-Content  outfile

User · Answer

If you need to loop inside a directory recursively for a particular kind of file  use the below command  which filters all the files of doc file type    fileNames   Get-ChildItem -Path  scriptPath -Recurse -Include   doc  If you need to do the filteration on multiple types  use the below command    fileNames   Get-ChildItem -Path  scriptPath -Recurse -Include   doc   pdf  Now  fileNames variable act as an array from which you can loop and apply your business logic

User · Answer

Other answers are great  I just want to add    a different approach usable in PowerShell  Install GNUWin32 utils and use grep to view the lines   redirect the output to file http   gnuwin32 sourceforge net   This overwrites the new file every time   grep  step 49   logIn log  gt  logOut log    This appends the log output  in case you overwrite the logIn file and want to keep the data   grep  step 49   logIn log  gt  gt  logOut log    Note  to be able to use GNUWin32 utils globally you have to add the bin folder to your system path

[powershell] Loop through files in a directory using PowerShell

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