linux获取随机数的方法集合

[root@master scripts]# echo $RANDOM
12465

[root@master scripts]# echo $((RANDOM+10000000))
10023190

[root@master scripts]# echo $RANDOM | md5sum | cut -c 1-8
ae74cedb

[root@master scripts]# uuidgen| md5sum | cut -c 1-8
fdfca8ec

[root@master scripts]# mkpasswd -l 8
6zhFj7T>

[root@master scripts]# echo `date +%s` | md5sum | cut -c 1-8
f6d58a59

[root@master scripts]# echo "`date +%s`$RANDOM" | md5sum | cut -c 1-8
0daddd89

[root@master scripts]# openssl rand -base64 4
jW/xRw==

[root@master scripts]# head /dev/urandom | cksum
1181625912 2520

[root@master scripts]# cat /proc/sys/kernel/random/uuid   == uuidgen
dfdec661-b0b7-48d3-b0db-73d1d7d09e06