I'm currently trying to analyze some connection logs for FTP connections to compile a list of users. The issue I'm facing is that my script runs really slowly because it reads through the log file multiple times to extract the usernames. The log files are quite large, so the performance is a concern.
Here's a snippet of my existing approach:
```powershell
$ftpConnections = Select-String -path $srcFilePath -pattern "Connected.*Port 21" | foreach{$_.ToString().split(' ')[5].trim("(",")")}
foreach($connection in $ftpConnections){
Select-String -casesensitive -path $srcFilePath -pattern "($connection).USER" >> $dstFilePath
}
```
In this code, I'm finding all lines matching "Connected.*Port 21" to extract the connection ID and then looping again to find the corresponding `USER` entries, storing those in a separate file. Is there any way I can combine these steps or optimize the code to make it run faster? Any help or tips would be great. Thanks!
1 Answer
A good way to speed things up is to grab both sets of lines from the log files in one go, which can reduce the amount of processing time. For example, try using:
```powershell
$InterestingLogItems = Select-String -casesensitive -path $srcFilePath -pattern "Connected.*Port 21|).USER"
```
Then you can filter through this variable afterward instead of querying the file multiple times. This should help you work with less data and enhance performance.
Additionally, if you're running into issues with overlapping connection IDs across multiple source files, consider processing one file at a time to prevent those collisions.
Thanks for the suggestion! I’m still working on some tweaks. The issue with the connection ID duplicates is proving tricky. Any thoughts on managing identifiers when stepping through multiple files?