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Practical tools and guides for system administrators

Command builders, cheat sheets and field-tested guides for the work you actually do on Windows Server, Active Directory and vSphere.

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26cheat sheets
101guides
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Windows command linerobocopy · reg · schtasks · sfc PowerShellGet-WinEvent · Get-Counter · Base64 Active Directorynltest · dcdiag · DFS · Kerberos VMwareesxcli · PowerCLI · Invoke-VMScript Networking and DNSipconfig · netstat · tracert · nslookup Storage and backupvssadmin · wbadmin · diskpart · mklink Security and accessicacls · runas · certutil · OpenSSL Linuxssh · disks · systemctl · vi
Tools

Run it in the browser, copy the command

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ROBOCOPY command builderBuild a /MIR copy with retries, logging and exclusions without guessing switches.Open tool PowerCLI command builderInventory, snapshot and VM power one-liners for vSphere, ready to paste.Open tool Windows Event Log Analyzer AIPaste an event, get the likely cause and the next command to run.Open tool IP subnet calculatorNetwork, broadcast, host range and mask for any CIDR block.Open tool DNS lookupA, MX, TXT, CNAME and NS records for any domain in one query.Open tool Port checkerIs the TCP port open from the internet, or is the firewall in the way.Open tool nltest command builderDomain controller discovery and secure channel checks, switch by switch.Open tool Windows 11 registry tweaksReady-to-import .reg files for the Windows 11 settings admins change most.Open tool
Cheat sheets

One page per tool, printable

Free PDF packFive cheat sheets, one PDFSubnets, PowerShell, Linux, HTTP codes and ESXi. Free, by email.Get the pack PS> Get-HelpPowerShell commandsPowerShell robocopy /MIR /LRobocopy: flags, filters and exit codesWindows command line Event ID 4625Windows Event IDsWindows /24 = 255.255.255.0Subnet masksNetworking esxcli system version getESXi command lineVMware $ ls -laLinux commandsLinux icacls D:\Share /TNTFS permissions and icaclsSecurity and access openssl x509 -textOpenSSLSecurity and access All cheat sheets
Latest guides

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PowerShellPS> upgrade PowerShell 7Sep 23, 2026 · GuideHow to upgrade PowerShell 7 on Windows 10 and 11PowerShell 7 installs beside Windows PowerShell 5.1, it does not replace it. How to upgrade with winget, the MSI, the ZIP or the MSIX...VMware~ # esxcli storageSep 23, 2026 · Troubleshootingesxcli storage core path list: reading and fixing ESXi storage pathsWhen a datastore goes read only at 02:00, or a LUN that used to have four paths suddenly has three, the answer is almost...Windows command lineC:\> reg querySep 22, 2026 · Troubleshootingreg query, reg add and reg export: the Windows registry from the command linereg.exe is the registry’s command line front end, and Microsoft’s own registry article for advanced users calls it the Console Registry Tool for Windows....Security and accessC:\> runasSep 21, 2026 · Troubleshootingrunas and UAC token filtering: why your admin window is not elevatedrunas starts a program under a different account than the one you are signed in with. It is the built-in answer to the rule...Active DirectoryC:\> dfsutilSep 20, 2026 · Guidedfsutil and dfsdiag: managing and diagnosing DFS Namespacesdfsutil and dfsdiag are the two command-line tools that come with the DFS Namespaces management feature. dfsutil reads and edits namespace configuration and the...Storage and backupC:\> diskshadowSep 19, 2026 · Troubleshootingdiskshadow in Windows: create, expose and delete shadow copiesHow to create a persistent VSS shadow copy with diskshadow, expose it as a drive letter, script it in a .dsh file, and delete...
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Five cheat sheets, one PDF

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About

Written from real infrastructure work

Hi, I’m Zaur, a system administrator working mainly with Windows infrastructure, VMware, AWS, automation and troubleshooting. This website brings together practical tools, cheat sheets and technical guides based on real-world infrastructure work. The goal is simple: help system administrators solve everyday tasks faster.

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