Create unique random numbers (UUIDs) in bash

ubuntu_ulysses

I want to create random unique numbers (UUIDs) as the following node.id=ffffffff-ffff-ffff-ffff-ffffffffffff First I tried this $ rndnum=` echo $RANDOM"-"echo $RANDOM"-"echo $RANDOM"-"echo $RANDOM"-"echo $RANDOM` $ echo $rndnum 30380-echo 21875-echo 14791-echo 32193-echo 11503 What is the right way to create the following (where f is any number)? ffffffff-ffff-ffff-ffff-ffffffffffff

Originally asked by yael on Stack Exchange (unix) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

On Linux, the util-linux / util-linux-ng package offers a command to generate UUIDs: uuidgen . $ uuidgen 5528f550-6559-4d61-9054-efb5a16a4de0 To quote the manual : The uuidgen program creates (and prints) a new universally unique identifier (UUID) using the libuuid (3) library. The new UUID can reasonably be considered unique among all UUIDs created on the local system, and among UUIDs created on other systems in the past and in the future. There are two types of UUIDs which uuidgen can generate: time-based UUIDs and random-based UUIDs. By default uuidgen will generate a random-based UUID if a high-quality random number generator is present. Otherwise, it will choose a time-based UUID. It...

Full answer by Haxiel: https://unix.stackexchange.com/a/500579 (CC BY-SA 4.0).

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