GUID V4 - Random-Based Identifier (Recommended)
GUID v4 is the most widely used random-based identifier. Learn about its structure, collision probability, advantages and why it is recommended for general-purpose applications.
How to Generate UUIDs in Bash
Generate UUIDs in Bash with system tools such as uuidgen. Random v4 values are broadly available, while v7 depends on the installed utility version.
Recommendation: use
uuidgen --random or equivalent tooling for UUID v4. Use UUID v7 only when your system tool explicitly supports it.How to generate UUID v4 in Bash
uuidgen --randomHow to generate UUID v7 in Bash
uuidgen --time-v7This only works on systems where the installed uuidgen version supports UUID v7.
Native support notes
- Bash does not have a built-in UUID generator.
- Tool availability and flags differ across Linux distributions and macOS environments.
- Document the exact system requirement if your scripts depend on UUID v7 support.
Practical notes
- Prefer portable shell scripts when UUID generation is part of automation pipelines.
- Fall back to application-layer generation if your shell environment is inconsistent.
- See the validator if you need to confirm the generated UUID version.
Frequently Asked Questions
No. Bash normally delegates UUID generation to a system tool such as
uuidgen.No. UUID v7 support in
uuidgen depends on the installed tool version and operating system packaging.Learn more
These articles expand on related concepts, formats and practical considerations.