案例需求
用shell脚本批量建立Linux用户
实现要求：创建用户student1到student50,指定组为student组！而且每个用户需要设定一个不同的密码！

实现脚本

#!/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

执行结果

[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.

输出文件

[root@arppinging scripts]# cat userlist.txt 

student1  2114716572
student2  2114210679
student3  247707542
student4  24285573
student5  6352319
student6  3218029353
student7  208547266
student8  52665904
student9  247106006
student10  57387229
student11  2119910618
student12  2616717096
student13  425723665
student14  3180432159
student15  184123909
student16  196088448
student17  1308115588
student18  2383911515
student19  2745018771
student20  269562862
student21  1124524793
student22  469429790
student23  14215545
student24  953612543
student25  2362926724
student26  1046118927
student27  2753416900
student28  677132365
student29  640032326
student30  1096512512
student31  856828828
student32  1528420840
student33  69394475
student34  2948020145
student35  2181024297
student36  706618857
student37  786028997
student38  111793209
student39  3091930571
student40  241441040
student41  136041083
student42  2902517667
student43  320702112
student44  40616442
student46  867923907
[root@arppinging scripts]#

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