mkpasswd是个小工具，可以随机生产密码，用起来很方便，默认是没有的，用yum安装

[root@ip-172-31-29-22 ~]# yum install -y expect
Loaded plugins: amazon-id, rhui-lb, search-disabled-repos
dockerrepo | 2.9 kB 00:00:00
rhui-REGION-client-config-server-7 | 2.9 kB 00:00:00
rhui-REGION-rhel-server-releases | 3.5 kB 00:00:00
rhui-REGION-rhel-server-rh-common | 3.8 kB 00:00:00
(1/2): rhui-REGION-rhel-server-releases/7Server/x86_64/updateinfo | 2.4 MB 00:00:00
(2/2): rhui-REGION-rhel-server-releases/7Server/x86_64/primary_db | 46 MB 00:00:01
Resolving Dependencies
--> Running transaction check
---> Package expect.x86_64 0:5.45-14.el7_1 will be installed
--> Processing Dependency: libtcl8.5.so()(64bit) for package: expect-5.45-14.el7_1.x86_64
--> Running transaction check
---> Package tcl.x86_64 1:8.5.13-8.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=============================================================================================================================================================================================
Package Arch Version Repository Size
=============================================================================================================================================================================================
Installing:
expect x86_64 5.45-14.el7_1 rhui-REGION-rhel-server-releases 262 k
Installing for dependencies:
tcl x86_64 1:8.5.13-8.el7 rhui-REGION-rhel-server-releases 1.9 M
Transaction Summary
=============================================================================================================================================================================================
Install 1 Package (+1 Dependent package)

生成密码，-l是要生成的密码长度，-s是包含几个特殊字符，-d是包含几个数字，-c是小写字符个数，-C是大写字符个数

[root@ip-172-31-29-22 ~]# mkpasswd -l 20 -s 4 -d 3 -c 3 -C 3
xgVYfo.py!0n$3hE1%et

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Linux 随机生成密码mkpasswd

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