第四周作业

1、统计出/etc/passwd文件中其默认shell为非/sbin/nologin的用户个数,并将用户都显示出来

 

[root@db01 ~]# grep -v "/sbin/nologin" /etc/passwd
root:x:0:0:root:/root:/bin/bash
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
guest:x:1000:1000:guest:/home/guest:/bin/bash
mageia:x:1100:1100::/home/linux:/bin/bash
slackware:x:2002:2019::/home/slackware:/bin/tcsh
[root@db01 ~]# grep -v "/sbin/nologin" /etc/passwd | wc -l
7

 

2、查出用户UID最大值的用户名、UID及shell类型

 

[root@csnode01 ~]# sort -n -t: -k3 /etc/passwd |tail -1|cut -d: -f1,3,7
nfsnobody:65534:/sbin/nologin

 

3、统计当前连接本机的每个远程主机IP的连接数,并按从大到小排序

 

[root@db01 scripts]# netstat -tn|tr -s " " : |cut -d: -f6|sort |uniq -c|sort -nr
2 192.168.0.230
1 Foreign
1

 

4、编写脚本 createuser.sh,实现如下功能:使用一个用户名做为参数,如果 指定参数的用户存在,就显示其存在,否则添加之;显示添加的用户的id号等 信息

 

[root@db01 scripts]# cat createuser.sh
#/bin/bash
#
read -p "Please input your username: " username
if id $username &> /dev/null;then
echo "$username exists"
else
useradd $username
echo "Add username finished"
echo "The $username info:`id $username`"
fi
[root@db01 scripts]# bash createuser.sh
Please input your username: mark
Add username finished
The mark info:uid=2004(mark) gid=2004(mark) groups=2004(mark)
[root@db01 scripts]# bash createuser.sh
Please input your username: mark
mark exists

 

5、编写生成脚本基本格式的脚本,包括作者,联系方式,版本,时间,描述等

 这题不会用shell脚本做,抄袭王老师的模板

[root@db01 ~]# cat .vimrc
set ignorecase
set cursorline
set autoindent
autocmd BufNewFile *.sh exec ":call SetTitle()"
func SetTitle()
if expand("%:e") == 'sh'
call setline(1,"#!/bin/bash")
call setline(2,"#")
call setline(3,"#********************************************************************")
call setline(4,"#Author: mark")
call setline(5,"#QQ: 88888888")
call setline(6,"#Date: ".strftime("%Y-%m-%d"))
call setline(7,"#FileName: ".expand("%"))
call setline(8,"#URL: http://www.magedu.com")
call setline(9,"#Description: The test script")
call setline(10,"#Copyright (C): ".strftime("%Y")." All rights reserved")
call setline(11,"#********************************************************************")
call setline(12,"")
endif
endfunc
autocmd BufNewFile * normal G

 

[root@db01 ~]# cat abc.sh
#!/bin/bash
#
#********************************************************************
#Author: mark
#QQ: 88888888
#Date: 2019-12-05
#FileName: abc.sh
#URL: http://www.magedu.com
#Description: The test script
#Copyright (C): 2019 All rights reserved
#********************************************************************
date +%F-%H

posted on 2019-12-05 14:37  mark_dq  阅读(115)  评论(0编辑  收藏  举报

导航