Generating globally unique values on Linux

I may expand this later. . . .

Query the file /proc/sys/kernel/random/uuid for a globally unique value. It produces a new value on each read. For a globally unique value that’s persistent between machine startup, query /proc/sys/kernel/random/boot_id.

[earth:/]120 % cat /proc/sys/kernel/random/uuid
78345a49-875f-48d3-aa80-130db5e57991

[earth:/]121 % cat /proc/sys/kernel/random/uuid
d258123d-f2bd-49c0-89d6-e4db5d377776

[earth:/]122 % cat /proc/sys/kernel/random/boot_id
e58a255a-0f6c-418f-ac0b-0fac81a5ff4a

[earth:/]123 % cat /proc/sys/kernel/random/boot_id
e58a255a-0f6c-418f-ac0b-0fac81a5ff4a
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