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About the author: Jim Chen, professionally recognized by the moniker "琳", serves as a distinguished software architect and integration specialist with over a decade of extensive expertise spanning web engineering, containerization technologies, and advanced AI orchestration. Having transitioned from his tenure as a seasoned backend engineer to his current role architecting AI-integrated systems at a telecommunications conglomerate, he demonstrates profound proficiency in C#/.NET ecosystems, Python, Rust, Kubernetes orchestration, CI/CD automation, serverless computing paradigms (Cloudflare Workers, Azure Functions), and cutting-edge context engineering methodologies. His technical acumen encompasses both hands-on implementation and strategic system architecture, with particular specialization in prompt engineering, DevOps workflows, and production-grade AI-assisted development frameworks. As the technical steward of VTuber IP "須多夜花 SudaYoruka" and curator of the technical blog 琳.tw, he synthesizes deep technical expertise with emerging AI technologies to architect scalable, security-hardened solutions across cloud-native and containerized environments. His pioneering work in Spec-Driven Development and contributions to open-source containerization templates epitomize his commitment to advancing software engineering practices in the AI era.
In Unix, programs generally do not interpret wildcards themselves. The shell interprets unquoted wildcards, and replaces each wildcard argument with a list of matching file names. if $archivedir might contain spaces, then rm $archivedir/*.bz2 might not do what you
You can disable this process by quoting the wildcard character, using double or single quotes, or a backslash before it. However, that's not what you want here - you do want the wildcard expanded to the list of files that it matches.
Be careful about writing rm $archivedir/*.bz2 (without quotes). The word splitting (i.e., breaking the command line up into arguments) happens after $archivedir is substituted. So if $archivedir contains spaces, then you'll get extra arguments that you weren't intending. Say archivedir is /var/archives/monthly/April to June. Then you'll get the equivalent of writing rm /var/archives/monthly/April to June/*.bz2, which tries to delete the files "/var/archives/monthly/April", "to", and all files matching "June/*.bz2", which isn't what you want.
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