一.简介 rand命令用来产生伪随机字节,随机数字产生器需要一个seed,在没有/dev/srandom系统下的解决方法是自己做一个~/.rnd文件 二.语法 openssl rand [-out file] [-rand file(s)] [-base64] [-hex] num 选项 -out file - write to file -engine e - use engine e, possibly a hardware device. -rand file:file:... - see