The '||' operator is used in shell scripts to execute the right-hand command only if the left-hand command returns a non-zero exit status, indicating failure. In the context of the provided answers, 'tar czf /backup/primary.tar.gz /data || /usr/local/bin/backup-fallback.sh' correctly represents the usage of '||', as it will only attempt to run the backup-fallback.sh script if the initial tar command fails.
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What does the '||' operator do in shell scripting?
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What is the significance of exit status in shell commands?
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Can you provide an example of error handling using '||'?