批量添加用户,并设置8位随机密码(禁止使用for,while等循环)
创建用户：
[root@lin lin]# echo oldboy{01..05}|xargs -n1
oldboy01
oldboy02
oldboy03
oldboy04
oldboy05
[root@lin lin]# echo oldboy{01..05}|xargs -n1|awk '{print "useradd "$NF}'
useradd oldboy01
useradd oldboy02
useradd oldboy03
useradd oldboy04
useradd oldboy05
交给bash执行
[root@lin lin]# echo oldboy{01..05}|xargs -n1|awk '{print "useradd "$NF}'|bash
设置随机密码
方法1：
[root@lin lin]# echo oldboy{01..05}:$(echo $RANDOM|md5sum|cut -c 1-8)|xargs -n1
oldboy01:2ea44fb5
oldboy02:24d3d6ab
oldboy03:d524fdff
oldboy04:92e6c1e7
oldboy05:9e6830d8
方法2：
[root@lin lin]# echo oldboy{01..05}:$((RANDOM +10000000))|xargs -n1
oldboy01:10029728
oldboy02:10003967
oldboy03:10029427
oldboy04:10021946
oldboy05:10020909
重定向到文件
[root@lin lin]# echo oldboy{01..05}:$((RANDOM +10000000))|xargs -n1>oldboypwd.txt
[root@lin lin]# cat oldboypwd.txt
oldboy01:10027086
oldboy02:10023644
oldboy03:10016532
oldboy04:10017825
oldboy05:10027238
修改密码
[root@lin lin]# chpasswd < oldboypwd.txt
方法3：
[root@lin tmp]# echo a{01..05}|xargs -n1|sed -r 's#(.*)#useradd \1;pass=$(echo $RANDOM|md5sum|cut -c 1-8);echo "$pass"|passwd --stdin \1;echo "\1 $pass" >> /tmp/user1.txt#g'|bash