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Why not load all the modules by default? Well, you actually may want to add many of the moduels that you encounter in later tutorials to be loaded on login. The reason they are not loaded by default is to keep things lean for those people simulating hurricanes who don't want to load Bioperl every time they log in. Occasionally two different modules also don't play nice together and you will get messages that you have to "swap" one for another.
Since module avail only shows shows all possible modules on ls5. To see the modules in the current context (i.e. based on your currently loaded modules), to see all possible modules use:
| Code Block |
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module list |
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