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Unix / Linux Interview Questions & Answers

Unix / Linux Technical Interview Questions

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How do hard links and symbolic links differ?

A hard link is another directory entry referring to the same underlying inode on a filesystem. Removing one name does not remove the data while other links or open references remain. A symbolic link i...

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A filesystem is full, but deleting a large log does not free space. What could explain it?

A running process may still hold the deleted file open, so its blocks remain allocated until the last relevant reference is closed. Inspect deleted-but-open files with a suitable tool such as lsof whe...

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How do SIGTERM and SIGKILL differ when stopping a process?

SIGTERM requests termination and can be handled so the application stops accepting work, finishes or cancels tasks, and releases resources. SIGKILL cannot be caught, blocked, or handled by the process...

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How would you schedule a recurring Linux job so two runs do not overlap?

Use an appropriate locking mechanism around the entire protected job, such as flock on a lock file in a directory accessible to the job’s user. Decide whether a second invocation should wait or exit a...

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