POSIX ACLs: Give Specific Users File Access Without Changing Ownership
Use POSIX ACLs to grant individual users or groups read/write access to a file without changing ownership or adding them to a Unix group.
Loading…
ReadMeFeed / Community knowledge
Unix
Real questions. Useful conversations. Find the people who know your stack.
Unix
Developer tools · #unix
Choosing Between Hard Links and Symbolic Links on Unix Filesystems
A quick decision guide for when to use hard links vs symlinks, covering cross‑filesystem limits, backup impact, and how to verify link behavior.
Choosing fork, vfork, or clone for Process Creation in Unix
A decision guide for picking fork, vfork, or clone in Unix-like systems, comparing overhead, memory sharing and portability with a concrete C example and validation steps using strace.
Composition Over Complexity: Leveraging Unix Pipes for Data Processing
Stop writing monolithic scripts for simple data tasks. Learn how to use Unix pipes to compose modular, maintainable data pipelines using stdout and stdin.
POSIX fcntl vs BSD flock: choosing Unix advisory file locks
Choose between POSIX fcntl record locks and BSD flock for Unix file coordination. Compare semantics, fork behavior, and NFS caveats before implementation.
Writing Reusable Awk Scripts with User‑Defined Functions
Learn how to define and call functions in awk, handle arguments and return values, and work around the language’s lack of true local variables.
awkDiagnosing ENOSPC When df Shows Free Space on Unix
A step‑by‑step guide to diagnose why Unix writes fail with ENOSPC while df reports free space, covering inode exhaustion, reserved blocks, deleted‑open files, and quota limits.
Diagnosing File Descriptor Exhaustion: EMFILE and ENFILE on Unix
A diagnostic guide for Unix EMFILE and ENFILE errors: how to tell per-process exhaustion from system-wide limits, inspect open descriptors, and apply targeted fixes.
Fix 'Too many open files' in systemd with a LimitNOFILE Drop-In
Create a systemd drop-in override with LimitNOFILE=65535, reload the manager, and restart the unit to raise the soft and hard RLIMIT_NOFILE for a service process.