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Even faster without the need for cut... :)
There is 1 alternative - vote for the best!
host -i `echo $SSH_CLIENT | cut -f 1 -d \ ` | sed 's/.* domain name pointer \(.*\)\./\1/'
to reverse lookup and get the hostname.
If you can do better, submit your command here.
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What is going on here with the
%% *?
It's a bash string operation that removes a suffix. In this case everything (*) following the first space in the variable $SSH_CLIENT - which looks like: "192.168.178.1 45721 22". So what is left is the ip.
From "man bash":
{parameter%%word} Remove matching suffix pattern.