A more streamline file check script

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http://www.linuxquestions.org – I am trying to do a script for checking if a program is available and installed, the idea is to automate the process a little bit so I don't have to go manually searching for them everytime I want to load them. What I've done so far does work, but I'm sure there is a more 'streamline' way of doing this script. Thanks in advance Code:   1 #!/bin/bash   2 GO="Found file"   3 AWOL="File not found"   4 MIA="Package not loaded"   5 INSTALLED="Package installed"   6 clear   7 echo -e "Make sure you're 'toor' and h (HowTos)