Month January 2017

Linux: Clear systemd log

You can use the following command, as superuser, to clear the systemd logs: Keep the last 7 days: journalctl –vacuum-time=7d Keep the last 100Mb: journalctl –vacuum-size=100M      

Powershell: Check when a LOCAL user was last logged in.

Within Powershell you can also see when a LOCAL user was last logged in.This can be done with the following one-liner: $([ADSI]”WinNT://$env:COMPUTERNAME”).Children | where {$_.SchemaClassName -eq ‘user’} | ft name,lastlogin example output: name lastlogin —- ——— {localadmin} {28/09/2016 08:57:19} {nx}…

Powershell: Find files larger than XXX

With Powershell you can also find files which are larger than a certain size.This can be accomplished with the command below.In this example we are looking for files larger than 100MB, on the C drive. Get-ChildItem c:\ -Recurse | Where-Object…

Powershell: Open TCP listener port

If you want to test a firewall rule, while the application isn’t ready yet, you can start that port on the Windows server using Powershell.This way you can test the firewall functionality.Those actions can be done with the following commands:…

Powershell: get TCP counters for IPv4

Performance issues. Everybody had them once, and more 🙂If you are using Windows 2012+ and Powershell, you can use the Get-Counter command in order to provide you more information regarding the TCP connections.In the example below, we are getting the…

Powershell: Set global dns searchlist

  If you want to configure the DNS suffix search list on Windows 2012+, you can use the set-DnsclientGlobalSetting command, as shown in the example below.This will set the DNS search list to “domain.local”: set-DnsClientGlobalSetting -SuffixSearchList  @(“domain.local”)    

Postfix: Clear postfix mail queue

Is your postfix mail queue full of spam? You are not the only one 🙂 In that case it could be interesting to clear your queue, before the spam gets send out. In order to remove all mail from the…