arc4random_uniform - Linux
Overview
arc4random_uniform is a command-line utility that generates random numbers using the arc4random algorithm. It is primarily used to generate pseudo-random numbers for various cryptographic and statistical purposes.
Syntax
arc4random_uniform [range]
Options/Flags
- range: The upper bound of the range from which to generate a random number. If not specified, the default range is 100.
Examples
Generating a Random Number in Range 0-99
arc4random_uniform
Generating a Random Number in Range 1-10
arc4random_uniform 10
Common Issues
- Seed Predictability: The arc4random algorithm is not cryptographically secure and should not be used for applications requiring high levels of security.
- Unexpected Output: If the specified range is negative or zero, arc4random_uniform will generate an error.
Integration
arc4random_uniform can be integrated with other Linux commands for more advanced tasks. For example, it can be used to generate random password strings:
echo "$(arc4random_uniform 10000)" | md5sum | cut -c10-19
Related Commands
- random: Generates random numbers from
/dev/urandom
for cryptographic purposes. - openssl rand: Provides a more secure and versatile random number generator.