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I'm trying to do the hello world app seen here https://www.ethereum.org/greeter#compiling-your-contract.

It says I should be able to do eth.getCompilers()

The first you can get by using a compiler. You should have a solidity compiler built in on your geth console. To test it, use this command:

So I have geth installed, but how am I supposed to do eth.getCompilers()? I'm I missing some install? My geth version is Version: 1.6.5-stable.

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It's been known for a while that the normal hello world example is broken.
See: Alternative to deprecated Greeter example code?

One thing he mentions is solc which is the command for Solidity, a compiler that takes the Javascript-esque Solidity language and compiles it to byte code for the Ethereum Virtual Machine (EVM).