LVM UUID Generator

Ever needed to generate an LVM UUID?

LVM UUIDs use a base-62 numbering system. In this case the numbering system consists of digits 0..9, letters a..z and A..Z. It consists of seven segments separated by hyphens. The first and last segments have six characters; all the segments between have four.
For example: ML8VkE-G3SN-D1Yo-9GsI-9Bca-Gl1E-lbQ5Bd

Here is a simple bash script to do just that.

#!/bin/env bash

base62=( 0 1 2 3 4 5 6 7 8 9
        'a' 'b' 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 'm'
        'n' 'o' 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' 'x' 'y' 'z'
        'A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M'
        'N' 'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' 'X' 'Y' 'Z' )

for ((i = 0 ; i < 6 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 4 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 4 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 4 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 4 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 4 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
echo -n '-'
for ((i = 0 ; i < 6 ; i++ )); do echo -n ${base62[ $(( $RANDOM % 61 )) ]}; done
  

It can also be used to generate passwords.

#!/bin/env bash

#### COPY base62 from above to below this line. ####

# if an integer is passed to this script it will be used for password length.
# N.B. each digit longer makes the password exponentially stronger!
# if no parameter is passed DEFAULT_LENGTH will be used.
DEFAULT_LENGTH=15

# this sets LENGTH to passed parameter or default 
LENGTH=${1:-$DEFAULT_LENGTH}

for ((i = 0 ; i < $LENGTH ; i++ ));
    do echo -n ${base62[ $(( $RANDOM % 61 )) ]};
done