for

[root@es3 data]# cat user_for.sh
#!/bin/bash
for i in {1..10};do
useradd user$i
PASS=`cat /dev/urandom | tr -dc '[:alnum:]' |head -c12`
echo $PASS | passwd --stdin user$i &> /dev/null
echo user$i:$PASS >> /root/user.log
echo "user$i is created"
done