How to generate random numbers by shell

This article mainly introduces shell how to generate random numbers, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

One: RANDOM

Echo $RANDOM

The random number of RANDOM has a range of 1Murray 32767, which can be cracked generally.

1.2 generate an eight-digit random password:

Echo $(($RANDOM+11111111))

Second: the password generated by MD5sum random encryption method is long.

Take a 9-digit password:

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

Three: generate random numbers through openssl

[root@web01 tmp] # openssl rand-base64 8

HInfIvtfOSk=

[root@web01 tmp] # openssl rand-base64 10

T67TCWO4DquFjAfee =

[root@web01 tmp] #

Four: get random numbers through time

Date +% s% N (s seconds N)

[root@web01 tmp] # date +% s% N

1494493822328919977

[root@web01 tmp] #

Five: mkpasswd

To use mkpasswd, first download expect

Yum install expect-y

[root@web01 scripts] # mkpasswd-l 10

\ dhr (V56zpT

[root@web01 scripts] # mkpasswd-l 18

UxtxtiLuk09wzDd [ga

[root@web01 scripts] #

6: device: / dev/urandom | cksum

[root@web01 scripts] # head / dev/urandom | cksum

3839730751 3262

[root@web01 scripts] #

Seven: the full name of the uid code is the only universal identification code:

[root@web01 scripts] # cat / proc/sys/kernel/random/uuid

Dbe7d254-11c2-42cc-b541-3f2a990daa8e

[root@web01 scripts] #

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