1.统计出/etc/passwd 文件中默认 shell 为非/sbin/nologin 的用户数,并将用户显示出来
# 显示用户
sed -r '/\/sbin\/nologin/d;s#([^:]*).*#\1#' /etc/passwd
# 显示用户数
grep -v '/sbin/nologin$' /etc/passwd|wc -l
2.查出用户 UID 最大值的用户名,UID 和 shell 类型
sort -rnt ':' -k 3 /etc/passwd|cut -d : -f 1,3,7
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
ss -tne|tr -s ' ' ':'|sed '1d'|cut -d ':' -f 6|sort|uniq -c|sort -rn
4.编写脚本 createuser.sh,实现如下功能
以一个用户名为参数,如果用户存在,就显示用户存在,否则添加并显示用户 id.
test $# -lt 1 && echo "No user name" && exit 1
id $1 &> /dev/null && echo "user $1 is existed,UID is `id -u $1`" && exit 1
useradd $1
echo "user is add successed.UID is `id -u $1`"
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
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: wang")
call setline(5,"#QQ: 123456789")
call setline(6,"#Date: ".strftime("%Y-%m-%d"))
call setline(7,"#FileName: ".expand("%"))
call setline(8,"#URL: http://mp.youkuaiyun.com/mdeditor/102885487.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