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27 lines
876 B
Markdown
27 lines
876 B
Markdown
# Produce A Lowercase V4 UUID
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There are [a variety of ways to produce a v4
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UUID](different-ways-to-generate-a-v4-uuid.md) on Unix-based machines. Of the
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options I listed in that post, my favorite is the `uuidgen` command. My only
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gripe with it is that it produces an all uppercase UUID.
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```bash
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$ uuidgen
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B7918C26-12AE-4093-B6DA-0D7D41C59FB6
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```
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Often when I need a UUID, it is to plug in as the ID value for some test data
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in a system that is using lowercase UUIDs. For the sake of consistency, I'd
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like it to be lowercase as well.
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The `tr` command comes in handy for this because I can _tr_anslate the
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uppercase characters to lowercase ones.
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```bash
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$ uuidgen | tr '[:upper:]' '[:lower:]'
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ed817cf3-8f70-4838-82bc-8e5b328c0b93
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```
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So now anytime I need a lowercase UUID, I hit `ctrl-r` and search back for
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either `uuid` or `lower` and find this command pretty quickly.
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