- date util
- ls util
- pwent util
- time util
- env util
- grep util
- ping util
- kill util
- xargs util
- nslookup util
- hexdump util
- sort util
- md5sum util
- curl util
- factor util (multithreaded)
- mail util (via sendmail)
- ps util (external call)
- JSON pretty printer
- show pid, uid, gid
- Signal handling
- Recursively traverse directory
- Count files in parallel (multiprocess)
- IPC via named pipe
- TCP multi-server
- TCP client
- Broadcast UDP diagram
- UNIX domain socket listener
- FTP client
- Archive to .tar.gz
- Make HTTP POST request
perl
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