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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 i...