Source: http://www.linuxstall.com/command-line-password-generator/
The random source in many UNIX system is /dev/random
and /dev/urandom
, but that’s a binary random source. To convert it into something usable as password, we can use tr
:
tr -dc '!-z' < /dev/urandom | fold -w10 | head -1
The fold
command folds the character stream into fixed line width. Similar use
would be head -w10
but it would not give you the new line at the end. Maybe
use [:alnum:]
is a better choice if password shall not contain any
punctuation.
Other methods include:
- Base64 encoding of something:
dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 -w 0 | rev | cut -b 2- | rev
- Base64 of the md5sum/sha256sum of something:
date +%s | sha256sum | base64 | head -c 32 ; echo
- Using OpenSSL’s random generator:
openssl rand -base64 32