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In my bash script I wish to ssh into a machine, and if the machine is down, perform something within an if statement.

To check whether or not the the machine is down I have an if statement using the -ne command which I use to compare the value returned by the ssh function ($? which is 255 if the ssh was unsuccessful) and 0.

However I get the following error

line 5: [0: command not found

Here is my code

#!/bin/bash

ssh blobbby

if [0 -ne $?]
then
    echo "ssh not succesful"
fi

If someone can please explain what mistake I've made I would be most grateful.

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A space character must follow the opening bracket and precede the closing one.

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