It’s not possible to remember everything you read and especially the one you are not going to use them frequently. That’s why we have bookmarked so you can refer whenever needed.

Working in IT, one thing you can’t ignore is to cheat sheet/reference guide. Having a relevant cheat sheet in your bookmark can help to troubleshoot the issues faster in your daily work life.

The following cheat sheet list will be helpful to you.

UNIX/Linux

Shell Cheat Sheet – get to know about file manipulation, test operators, variable substitution, conditional execution, logical tests, useful variables, file tests and much more.

Bash History – vi history editing shortcuts, behavior modification through shell variables, history expansions, etc.

UNIX Toolbox – a great collection of commands for a system, process, file system, SSH/SCP, RSYNC, shells, scripting, database, printing, etc.

Fedora/Ubuntu Commands – a quick command list tested on Fedora/Ubuntu for file searching, compression, directory navigation, rsync, ssh, wget, text manipulation, networking, disk space, system information.

Linux Admin Quick Reference – five pages PDF file gives you essential information to know as a system admin for user management, NFS file sharing, printer configuration, kernel rebuild, IP tables, network configuration, etc.

VI cheat sheet – working often in vi? You will love this. Cover movements, deletion, search/replace, insert, etc.

Linux Performance – various Linux performance materials including tools map.

Linux Security – a quick reference guide including general security tips, kernel security, file permissions & attributes, DNS security, etc.

AIX QuickSheet – working on AIX? This covers a large number of commands you need on a daily basis as an administrator from FS, Kernel tuning, error logging, devices, networking, memory, LVM, packages, etc.

and one more… by IBM

Solaris Quick Reference – still using Solaris? Don’t worry, this will help you in the administration guide including user initialization, network configuration, file sharing, printing commands, shell programming, CDE configuration, etc.

Networking

TCP/IP and tcpdump – pocket reference guide by SANS include much useful information to understand TCP/IP stacks and tcpdump usage.

Another tcpdump command cheat sheet

Protocol Encapsulation – cover TCP/IP, Novell Netware, DECnet, AppleTalk, ISO.

You may refer to this for BGP, EIGRP, NAT, IPv4/IPv6, PPP, RIP, etc.

NMAP – A quick NMAP 5 cheat sheet.

TCP Port – get to know which port is for what.

Web & Application Server

IBM WebSphere Portal Performance Cheat Sheet – this would be useful if looking for performance tuning cheat sheet for WebSphere Portal 6.1.x

Apache Tomcat – Getting started with Apache Tomcat cover installation, directory layout, classloading, embedding, configuration, web.xml, logging, listeners, JNDI and much more.

WebLogic Server – Interactive Quick Reference by Oracle is good to start to understand the WebLogic architecture and administration guide.

Apache – Quick reference guide helps you to understand general configuration directives, command-line options, scripting, cache, logging, CGI variables, SSI, etc.

Jboss – getting started with JBoss EAP 7 cover almost everything you need to know as a beginner.

JDBC – all you need to know about JDBC from basic configuration, driver types, architecture, performance tuning to advanced JDBC.

I hope this cheat sheet list helps you learn more about OS, Networking, Web & Application Server. As usual, share this with your friends.