A Linux administrator runs the command ping -c 1 192.168.1.255 || echo "Host is not responding.". Under which of the following conditions will the message "Host is not responding." be displayed on the terminal?
Only if the ping command successfully reaches the host.
Only if the ping command fails to reach the host.
The message will always be displayed, regardless of the ping result.
The message will never be displayed because of a syntax error.
In shell scripting, the || operator is a logical OR. It creates a conditional execution chain where the command on the right is executed only if the command on the left fails, returning a non-zero exit status. A successful ping command returns an exit status of 0. If the ping command cannot reach the host, it will fail and return a non-zero exit status, which then triggers the echo command to execute.
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What does it mean for a command to 'succeed' or 'fail' in the context of shell scripting?
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Can you explain other logical operators used in shell scripting besides `||`?
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What are some practical examples of using the `||` operator in scripts?