CentOS7 入門實戰視頻課程筆記
http://zhongcl.blog.51cto.com/1389550/1902252
解決辦法：
登入root
進入/etc/resolv.conf
vim /etc/resolv.conf
修改內容為下（將DNS地址改為google域名服務器）
nameserver 8.8.8.8
nameserver 8.8.4.4
擴展：
resolv.conf是DNS域名解析的配置文件，它的格式很簡單，每行以一個關鍵字開頭，後接配置參數。resolv.conf的關鍵字主要有四個，分別是：
nameserver #定義DNS服務器的IP地址 domain #定義本地域名 search #定義域名的搜索列表 sortlist #對返回的域名進行排序
/etc/resolv.conf的一個示例：
domain test.com search www.test.com test.com nameserver 202.96.128.86 nameserver 202.96.128.166
最主要是nameserver關鍵字，如果沒指定nameserver就找不到DNS服務器，其它關鍵字是可選的。
scp index.html [email protected]: /root:意思是將剛才下載的index.html文件發送到遠程服務器上，目錄是root目錄
hostname:查看主機名
hostname abc.com:將主機名修改為abc.com
nslookup www.baidu.com
vi /etc/hosts:可以修改IP地址所對應的域名。
ssh 192.168.5.90 :遠程登錄一個主機
vi /etc/resolv.conf:修改DNS的IP地址
--------------------------跟系統相關的命令--------------------------------
reboot:重啟服務器
shutdaown -r now
init 6
init 0:關閉服務器
shutdown -h now:馬上關機
shutdown -h 20:25:設置關機時間
mount /dev/cdrom /abc:掛載
umount /abc:取消掛載
df -h:查看掛載的情況
free:查看內存的情況
top:查看cpu的利用率
date:查看日期
cal:查看日歷
cal 2014 :查看某一年的日歷
date 030617002015:將日期設置為2015年的3月6日下午的5點鐘
rpm -aq:列出系統中安裝的所有程序
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打印SQL:SELECT a.case_id AS caseNum, b.name AS custName, a.case_amount AS caseAmount, e.name AS case_overdue_name, a.late_days AS lateDays, a.entrust_start_date AS entrustStartDate, a.entrust_end_date AS entrustEndDate, 0 AS case_process, ‘‘ AS teamName, ‘‘ AS staffName, a.id AS caseId, a.handin_time AS handin_time, a.permanent_collection, a.temporary_collection, a.case_call_type, (case when a.case_status >=0 and permanent_collection is null then ‘未分案‘ when a.case_status >= 0 then ‘在催‘ when a.case_status = -1 then ‘出催‘ when a.case_status <= -2 then ‘流轉‘ end) as caseStatus, a.case_enter_date,a.case_end_time FROM dic_coll_consume.cf_case_info a, dic_coll_consume.cf_cust_essential_info b, dic_coll_consume.cf_case_stage_type e WHERE a.cust_id = b.id AND a.case_stage_type = e.id and (a.permanent_collection in (3) or a.temporary_collection in (3)) |
打印SQL:SELECT a.case_id AS caseNum, b.name AS custName, a.case_amount AS caseAmount, e.name AS case_overdue_name, a.late_days AS lateDays, a.entrust_start_date AS entrustStartDate, a.entrust_end_date AS entrustEndDate, 0 AS case_process, ‘‘ AS teamName, ‘‘ AS staffName, a.id AS caseId, a.handin_time AS handin_time, a.permanent_collection, a.temporary_collection, a.case_call_type, (case when a.case_status >=0 and permanent_collection is null then ‘未分案‘ when a.case_status >= 0 then ‘在催‘ when a.case_status = -1 then ‘出催‘ when a.case_status <= -2 then ‘流轉‘ end) as caseStatus, a.case_enter_date,a.case_end_time FROM dic_coll_consume.cf_case_info a, dic_coll_consume.cf_cust_essential_info b, dic_coll_consume.cf_case_stage_type e WHERE a.cust_id = b.id AND a.case_stage_type = e.id and (a.permanent_collection in (3) or a.temporary_collection in (3))
打印SQL:SELECT a.case_id AS caseNum, b.name AS custName, a.case_amount AS caseAmount, e.name AS case_overdue_name, a.late_days AS lateDays, a.entrust_start_date AS entrustStartDate, a.entrust_end_date AS entrustEndDate, 0 AS case_process, ‘‘ AS teamName, ‘‘ AS staffName, a.id AS caseId, a.handin_time AS handin_time, a.permanent_collection, a.temporary_collection, a.case_call_type, (case when a.case_status >=0 and permanent_collection is null then ‘未分案‘ when a.case_status >= 0 then ‘在催‘ when a.case_status = -1 then ‘出催‘ when a.case_status <= -2 then ‘流轉‘ end) as caseStatus, a.case_enter_date,a.case_end_time FROM dic_coll_consume.cf_case_info a, dic_coll_consume.cf_cust_essential_info b, dic_coll_consume.cf_case_stage_type e WHERE a.cust_id = b.id AND a.case_stage_type = e.id and (a.permanent_collection in (2698,2704,2705,2707,2708,2709,2710,2716,2719,2720,2717) or a.temporary_collection in (2698,2704,2705,2707,2708,2709,2710,2716,2719,2720,2717))
正常：
打印SQL:SELECT a.case_id AS caseNum, b.name AS custName, a.case_amount AS caseAmount, e.name AS case_overdue_name, a.late_days AS lateDays, a.entrust_start_date AS entrustStartDate, a.entrust_end_date AS entrustEndDate, 0 AS case_process, ‘‘ AS teamName, ‘‘ AS staffName, a.id AS caseId, a.handin_time AS handin_time, a.permanent_collection, a.temporary_collection, a.case_call_type, (case when a.case_status >=0 and permanent_collection is null then ‘未分案‘ when a.case_status >= 0 then ‘在催‘ when a.case_status = -1 then ‘出催‘ when a.case_status <= -2 then ‘流轉‘ end) as caseStatus, a.case_enter_date,a.case_end_time FROM dic_coll_consume.cf_case_info a, dic_coll_consume.cf_cust_essential_info b, dic_coll_consume.cf_case_stage_type e WHERE a.cust_id = b.id AND a.case_stage_type = e.id and (a.permanent_collection in (2698,2704,2705,2707,2708,2709,2710,2716,2719,2720,2717) or a.temporary_collection in (2698,2704,2705,2707,2708,2709,2710,2716,2719,2720,2717))
打印SQL:SELECT a.case_id AS caseNum, b.name AS custName, a.case_amount AS caseAmount, e.name AS case_overdue_name, a.late_days AS lateDays, a.entrust_start_date AS entrustStartDate, a.entrust_end_date AS entrustEndDate, 0 AS case_process, ‘‘ AS teamName, ‘‘ AS staffName, a.id AS caseId, a.handin_time AS handin_time, a.permanent_collection, a.temporary_collection, a.case_call_type, (case when a.case_status >=0 and permanent_collection is null then ‘未分案‘ when a.case_status >= 0 then ‘在催‘ when a.case_status = -1 then ‘出催‘ when a.case_status <= -2 then ‘流轉‘ end) as caseStatus, a.case_enter_date,a.case_end_time FROM dic_coll_consume.cf_case_info a, dic_coll_consume.cf_cust_essential_info b, dic_coll_consume.cf_case_stage_type e WHERE a.cust_id = b.id AND a.case_stage_type = e.id and (a.permanent_collection in (3) or a.temporary_collection in (3))
CentOS7 入門實戰視頻課程筆記