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randoms

Generate high quality random numbers the easy way

This is one of those scripts I should have written a long time ago.

Here's the output from running the script with the -h option:

randoms: usage:
  randoms [-f|-F|-x|-X|-8|-o|-d|-p] [DIGITS [LINES]]
    -f:     hexadecimal output
    -F:     hexadecimal output, with upper-case letters
    -x:     like "-f", but with "0x" prefixes
    -X:     like "-F", but with "0x" prefixes
    -8:     octal output
    -o:     like "-8", but with "0" prefixes
    -d:     decimal output, with no leading zeros
    -p:     random passwords
    DIGITS: number of digits (or characters) output per line
    LINES:  number of output lines, or "-" for unlimited
    ** Default output is decimal format, 18 digits, 1 line

Examples:
* Print 5 random decimal strings, each with 3 digits:
    randoms 3 5

* Print 1 random hexadecimal string with 32 digits:
    randoms -f 32

* Print 1 random decimal string with 300 digits:
    randoms 300

* Print 1 random password string with 12 characters:
    randoms -p 12

* Print 5 random MAC addresses:
    randoms -F 12 5 | sed 's!.\{2\}!&:!g ; s!:$!!' 

* Print a random (but probably invalid) UUID:
    randoms -f 32 | sed -E 's/(.{8})(.{4})(.{4})(.{4})/\1-\2-\3-\4-/'

* Print a (valid) random UUID (of a known or unknown variant; DCE, NCS, Microsoft, undefined):
    randoms -f 31 | sed -E 's/(.{8})(.{4})(.{3})(.{4})/\1-\2-4\3-\4-/'