The method of generating random numbers in Shell series

One: RANDOM

Echo $RANDOM

Random number is a range of 1--32767, generally used it can be cracked

1.2 Generate a eight-digit random password:

echo $ (($RANDOM +11111111))

Two: Md5sum random encryption method generates a longer password

Take 9-digit password:

echo $RADDOM |md5sum|cut-c 2-9

III: Generate random numbers through OpenSSL

[Email protected] tmp]# OpenSSL rand-base64 8

hinfivtfosk=

[Email protected] tmp]# OpenSSL rand-base64

t67tcwo4dqufja==

[Email protected] tmp]#

Four: Get random numbers by time

Date +%s%n (S-S N)

[Email protected] tmp]# date +%s%n

1494493822328919977

[Email protected] tmp]#

V: mkpasswd

To use mkpasswd first download expect

Yum Install Expect-y

[Email protected] scripts]# mkpasswd-l

\DHR (v56zpt

[Email protected] scripts]# mkpasswd-l 18

Uxtxtiluk09wzdd[ga

[Email protected] scripts]#

Six: Equipment:/dev/urandom|cksum

[Email protected] scripts]# head/dev/urandom|cksum

3839730751 3262

[Email protected] scripts]#

Seven: The UUID code is the universal unique identification code:

[Email protected] scripts]# cat/proc/sys/kernel/random/uuid

dbe7d254-11c2-42cc-b541-3f2a990daa8e

[Email protected] scripts]#

Eight: Generally use two methods to encrypt the more secure

The method of generating random numbers in Shell series