One-liners and Short Manuals

In this repository I have collected useful one-liners and short manuals.

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Table of Contents

1. One-liners
   1.1. Linux one-liners
   1.2. VMware one-liners
   1.3. Windows one-liners
2. Short manuals
   2.1. Linux short manuals
   2.2. VMware short manuals
   2.3. Windows short manuals

One-liners

Linux one-liners

• Show audit.log in readable form:
  sudo cat /var/log/audit/audit.log | perl -ne 'chomp; if ( /(.*msg=audit\()(\d+)(\.\d+:\d+.*)/ ) { $td = scalar localtime $2; print "$1$td$3\n"; }'

• Count number of clients connected to Chrony NTP server:
  chronyc -a -n -m clients | wc -l

• Running a command on a group of servers with ansible:
  ansible -m shell -a '<command>' <group_hosts_name> --ask-pass

• Rescan all drives to mount a new drive:
  for host in /sys/class/scsi_host/*; do echo "- - -" | sudo tee $host/scan; ls /dev/sd* ; done

• Disk write speed test:
  sync; date; dd if=/dev/zero of=/data/tempfile bs=10M count=5000; sync; date

VMware one-liners

• Find all VM snapshots:
  get-vm | get-snapshot | Select-Object -Property vm,created,sizeGB,name,description | Export-Csv -Path C:\Users\$env:username\Desktop\snapshots.csv

• Search for all VMs created in the last 30 days:
  Get-VIEvent -maxsamples 1000000 -Start (Get-Date).AddDays(-30) | where {$_.Gettype().Name-eq "VmCreatedEvent" -or $_.Gettype().Name-eq "VmBeingClonedEvent" -or $_.Gettype().Name-eq "VmBeingDeployedEvent"} |Sort CreatedTime -Descending |Select CreatedTime, UserName,FullformattedMessage |export-Csv "C:\scripts\createvm.csv" -NoTypeInformation

• Find all VMs that have been restarted in the last 24 hours (there is the word "restarted" in the logs):
  Get-VIEvent -MaxSamples 100000 -Start (Get-Date).AddDays(-1) -Type Warning | Where {$_.FullFormattedMessage -match "restarted"} |select CreatedTime,FullFormattedMessage | sort CreatedTime –Descending

• Find a VM with a specific IP address:
  Get-VM | Where-Object -FilterScript { $_.Guest.Nics.IPAddress -contains "AB.CD.EF.GH" }

• Find a VM with a specific MAC address:

$report =@() 
Get-VM | Get-View | %{ 
 $VMname = $_.Name 
 $_.guest.net | where {$_.MacAddress -eq "AB:CD:EF:GH:IJ:KL"} | %{
        $row = "" | Select VM, MAC
        $row.VM = $VMname 
        $row.MAC = $_.MacAddress 
        $report += $row 
  } 
  } 
$report

Windows one-liners

• Advanced User Accounts panel:
  Run PowerShell ➜ netplwiz

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Short manuals

Linux short manuals

• How to make a connection from a remote network to both network interfaces of the server without configuring asynchronous routing:
  sysctl -w net.ipv4.conf.all.rp_filter=2
• Permanent setting in /etc/sysctl.conf
• Additional information: https://access.redhat.com/solutions/53031

VMware short manuals

¯\_(ツ)_/¯

Windows short manuals

• How to install Windows 11 without an Internet connection:
  "Let’s Connect You To A Network" page ➜ Shift + F10 ➜ Command Prompt ➜ kill "Network Connection Flow" process (taskkill /F /IM oobenetworkconnectionflow.exe)

• How to change my password inside RDP session:
  Ctrl + Alt + End inside RDP session ➜ Change a password

• How to change my password inside RDP session inside another RDP session:
  Setup: My PC ➜ The 1st RDP session ➜ The 2nd RDP session
Task: Change my password in the 2nd RDP session
Method 1. Run PowerShell ➜ (New-Object -COM Shell.Application).WindowsSecurity() ➜ Change a password
Method 2. Run the On-Screen Keyboard (osk.exe) ➜ hold Ctrl + Alt on the physical keyboard ➜ click on the Del key in the on screen keyboard ➜ Change a password

• How to delete (or another action) multiple items in Visual Studio Code:
  Select the code ➜ Ctrl + Shift + L ➜ multiple cursors ➜ delete (or another action) items