shell 杂项

目录：

1--- 获取系统时间

2---

3---

4---

5---

 

 

 

 

1--- 获取系统时间

当前时间

 today=$(date -d "today" '+%Y%m%d %H:%M:%S')

 [root@localhost ~]# today=$(date -d "today" '+%Y%m%d %H:%M:%S')
 [root@localhost ~]# echo $today                                                             
 20100820 09:22:16                                                                                  

 

当前时间的前一天 

prevday=$(date -d "yesterday $today" '+%Y%m%d %H:%M:%S')

 [root@localhost ~]# prevday=$(date -d "yesterday $today" '+%Y%m%d %H:%M:%S')
 [root@localhost ~]# echo $prevday                                                                                
 20100819 09:22:16