Log cleanup automation in PowerShell - Step-by-Step Execution

Concept Flow - Log cleanup automation

Start script

↓

Set log folder path

↓

Get list of log files

↓

For each file

↓

Check file age > threshold?

No→Skip file

Yes↓

Delete file

↓

Repeat for next file

↓

End script

The script starts by setting the folder path, then checks each log file's age. If older than the set days, it deletes the file, repeating until all files are processed.

Execution Sample

PowerShell

 $logPath = "C:\Logs"
 $days = 7
 Get-ChildItem $logPath -Filter *.log | ForEach-Object {
   if (((Get-Date) - $_.LastWriteTime).Days -gt $days) {
     Remove-Item $_.FullName
   }
 }

This script deletes .log files older than 7 days in the C:\Logs folder.

Execution Table

Step	Action	File Processed	File Age (days)	Condition (Age > 7)	Result
1	Get list of .log files	N/A	N/A	N/A	Files found: app.log, error.log, old.log
2	Check app.log	app.log	3	3 > 7? False	Skip file
3	Check error.log	error.log	10	10 > 7? True	Delete file
4	Check old.log	old.log	15	15 > 7? True	Delete file
5	End of files	N/A	N/A	N/A	Script ends

💡 All files processed; script ends after checking all files.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
$logPath	"C:\Logs"	"C:\Logs"	"C:\Logs"	"C:\Logs"	"C:\Logs"	"C:\Logs"
$days	7	7	7	7	7	7
Current File	N/A	app.log	error.log	old.log	N/A	N/A
File Age	N/A	3	10	15	N/A	N/A
Files Deleted	0	0	1	2	2	2

Key Moments - 3 Insights

Why does the script skip some files instead of deleting them?

Files are skipped if their age in days is not greater than the threshold (7 days). See execution_table rows 2 and 3 where app.log is skipped because 3 > 7 is False.

How does the script determine the file's age?

The script subtracts the file's LastWriteTime from the current date and checks the Days property. This is shown in execution_table column 'File Age (days)'.

What happens if there are no log files in the folder?

The script gets an empty list and ends immediately after step 1 with no files processed, as implied by the exit_note.

Visual Quiz - 3 Questions

Look at the execution table, what is the file age of error.log at step 3?

A 10 days

B 3 days

C 15 days

D 7 days

💡 Hint

Check the 'File Age (days)' column in execution_table row 3.

At which step does the script delete the first file?

A Step 4

B Step 2

C Step 3

D Step 1

💡 Hint

Look at the 'Result' column in execution_table to see when 'Delete file' first appears.

If the $days variable was changed to 2, what would happen to app.log at step 2?

A It would be skipped

B It would be deleted

C Script would error

D It would be renamed

💡 Hint

Compare the file age (3 days) to the new threshold (2 days) using the condition in execution_table.

Concept Snapshot

Log cleanup automation in PowerShell:
- Use Get-ChildItem to list log files
- Check each file's LastWriteTime against current date
- Delete files older than a set number of days
- Loop through all files
- Script ends after all files checked

Full Transcript

This PowerShell script automates cleaning up log files by deleting those older than a specified number of days. It starts by setting the folder path and the age threshold. Then it lists all .log files in the folder. For each file, it calculates the age by subtracting the file's last write time from the current date. If the file is older than the threshold, it deletes the file; otherwise, it skips it. This process repeats until all files are checked, then the script ends.