Lazy I am so I created a shortcut for checking if a package is installed in Slackware. Packages are listed on /var/log/packages so basically a basic ls | grep combo is needed to see if a package is already installed. Below is my little script and I name it as pkgfind.
#!/bin/sh
if [ "$1" == "" ]; then
echo "Usage: pkgfind <package-name>"
exit 1
fi
ls /var/log/packages | grep "$1"
This is located at my bin directory at ~/bin/pkgfind. Add an execute bit to it and be sure the path is added to user’s path so that the current user can use it anywhere. Or if you wanted a global script, put it in /usr/bin/pkgfind.
Example:
lysender@darkstar:~$ pkgfind opencv opencv-2.3.1a-i486-2_SBo lysender@darkstar:~$ pkgfind lolcat lysender@darkstar:~$ pkgfind ffmpeg ffmpeg-0.10.2-i686_custom-1_SBo lysender@darkstar:~$
I synced it u with SpiderOak so that I could also use it in the office.