Linux "rand" Command Line Options and Examples
pseudo-random number generator

The rand command outputs num pseudo-random bytes after seeding the random number generator once. As in other openssl command line tools, PRNG seeding uses the file $HOME/.rnd or .


openssl rand [-help] [-out file] [-rand file(s)] [-base64] [-hex] num

Command Line Options:

Print out a usage message.
rand -help ...
Write to file instead of standard output.
rand -out ...
Use specified file or files or EGD socket (see RAND_egd(3)) for seeding the random number generator.Multiple files can be specified separated by an OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others.
rand -rand ...
Perform base64 encoding on the output.
rand -base64 ...
Show the output as a hex string.
rand -hex ...