案例需求
用shell指令碼批量建立linux使用者
實現要求：建立使用者student1到student50,指定組為student組！而且每個使用者需要設定乙個不同的密碼！
實現指令碼
#!/bin/bash
grep 'student' /etc/group >/dev/null 2>/dev/null
[ $? -eq 0 ] || groupadd student >/dev/null 2>/dev/null
for i in `seq 50`
do id student$i >/dev/null 2>/dev/null;
[ $? -eq 0 ] && echo -e "[\033[31merror\033[0m]user student$i is exist." && continue;
useradd -g student student$i >/dev/null 2>/dev/null;
pass=`echo "$random$random"`;
[ $? -eq 0 ] && echo -e "[\033[32mok\033[0m]user student$i create success." && echo "$pass" | passwd student$i --stdin >/dev/null 2>/dev/null;
[ $? -eq 0 ] && echo "student$i $pass" >> userlist.txt
done
[ok]user student1 create success.
[ok]user student2 create success.
[ok]user student3 create success.
[ok]user student4 create success.
[ok]user student5 create success.
[ok]user student6 create success.
[ok]user student7 create success.
[ok]user student8 create success.
[ok]user student9 create success.
[ok]user student10 create success.
[ok]user student11 create success.
[ok]user student12 create success.
[ok]user student13 create success.
[ok]user student14 create success.
[ok]user student15 create success.
[ok]user student16 create success.
[ok]user student17 create success.
[ok]user student18 create success.
[ok]user student19 create success.
[ok]user student20 create success.
[ok]user student21 create success.
[ok]user student22 create success.
[ok]user student23 create success.
[ok]user student24 create success.
[ok]user student25 create success.
[ok]user student26 create success.
[ok]user student27 create success.
[ok]user student28 create success.
[ok]user student29 create success.
[ok]user student30 create success.
[ok]user student31 create success.
[ok]user student32 create success.
[ok]user student33 create success.
[ok]user student34 create success.
[ok]user student35 create success.
[ok]user student36 create success.
[ok]user student37 create success.
[ok]user student38 create success.
[ok]user student39 create success.
[ok]user student40 create success.
[ok]user student41 create success.
[ok]user student42 create success.
[ok]user student43 create success.
[ok]user student44 create success.
[error]user student45 is exist.
[ok]user student46 create success.
[error]user student47 is exist.
[error]user student48 is exist.
[error]user student49 is exist.
[error]user student50 is exist.
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