geth attach on testnet error

April 9, 2017

If you are trying to run the command geth attach and you get this error

> Fatal: Unable to attach to remote geth: dial unix /Users/<username>/Library/Ethereum/geth.ipc: connect: no such file or directory

it is because geth cannot find the file geth.ipc. This typically happens when you have run geth –testnet. This file gets generated at run time.

To fix this, run geth attach with the additional ipc command. ie

> geth attach ipc:/Users/<username>/Library/Ethereum/testnet/geth.ipc

and that should do the trick!

Installing Solidity on OSX

If you are trying to install Solidity on OSX these are the commands you need to run.

brew update
brew upgrade
brew tap ethereum/ethereum
brew install solidity
brew linkapps solidity

If you get this error:

==> Installing solidity from ethereum/ethereum
Error: You must `brew link cmake` before ethereum/ethereum/solidity can be installed

it means you need to run “brew link cmake” as instructed. If you run brew doctor you will find a similar reason.

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

The tricky part is that when you run “brew link cmake” you might encounter this error:

Linking /usr/local/Cellar/cmake/3.7.2_1... 
Error: Could not symlink share/emacs/site-lisp/cmake
/usr/local/share/emacs/site-lisp is not writable.

To fix this, run

sudo chown -R cloudnthings /usr/local/share/emacs/site-lisp/
sudo chmod -R u+w /usr/local/share/emacs/site-lisp/

This should then result in:

cloudnthings:~ cloudnthings$ brew link cmake
Linking /usr/local/Cellar/cmake/3.7.2_1... 28 symlinks created





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