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2. The "/usr/libexec/i3blocks/iface" script that comes bundled with i3blocks is buggy.
But it's not! If I run the script on the terminal, it fulfills what it promises. Displays my local IP address twice.
Still, if I edit the script and change the IPADDR variable to ... "potato" (BATATA, in portuguese), potato appears in the bar of i3blocks! Where the IP should appear. If I put a dummy IP, it also works.
So the script is not setting the variable? But if it is not, how does it work if run in the terminal?
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