dpkg: Listing installed packages

If you want to check what packages are installed on a debian based machine you can use dpkg.

slize:~# dpkg --list  
Desired=Unknown/Install/Remove/Purge/Hold  
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend  
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)  
||/ Name Version Description  
+++-===========================================  
ii adduser 3.110 add and remove users and groups  
ii apache2 2.2.9-10+lenny7 Apache HTTP Server metapackage  
ii apache2-mpm-prefork 2.2.9-10+lenny7 Apache HTTP Server - traditional non-threaded model

Or if you are looking for a specific package you can put the name after the command.

slize:~# dpkg --list apache2  
Desired=Unknown/Install/Remove/Purge/Hold  
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend  
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)  
||/ Name Version Description  
+++-=============================================================-ii  
apache2 2.2.9-10+lenny7 Apache HTTP Server metapackage
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Benjamin Cane
Principal Engineer, Vice President

Benjamin Cane is Principal Engineer at American Express. He has more than 16 years of experience with roles in both systems and software engineering. He leverages both his systems and software skills to build end-to-end platforms. Platforms, purpose built for performance and resiliency. Benjamin is also the author of Red Hat Enterprise Linux - Troubleshooting Guide (2015, Packt Publishing), and he has published many popular articles on topics such as Linux, Docker, Python, Go and Performance Tuning. Thoughts and Opinions expressed in my articles are my own.

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