Like I would do wget -O - http://blockchain.info/q/getblockcount 2>/dev/null
for the main net.
2 Answers
Blockchain.info does not track the testnet, but blockexplorer.com does. In fact the API you're using was originally from blockexplorer.com, and blockchain.info simply adopted it.
wget -O - http://blockexplorer.com/testnet/q/getblockcount 2> /dev/null
or shorter
curl http://blockexplorer.com/testnet/q/getblockcount
-
1
BlockExplorer doesn't work anymore for me (redirecting to testnet.blockexplorer.com which throws a 502) so I found a new alternative:
http://tbtc.blockr.io/api/v1/coin/info
You have to get the "last_block" element.
(For mainnet: http://btc.blockr.io/api/v1/coin/info)