# ocfs2_hb_ctl -I -d /dev/mapper/backup2-backup2 508C2154503344E78ACD6CD6B000000: 2 refs #The previous step will list the amount of refs (references to heartbeat) # ocfs2_hb_ctl -K -d /dev/mapper/backup2-backup2 UUID ( repeat until refs = 0) # lvdisp…

In AIX, there is rmdev command to remove a disk/LUN from /dev directory i.e to make the disk/LUN unavailable to the whole OS before physically removing it.   But in Linux, there's no specific command to the same. Here's how you will actually do it:  …

前言 我比较喜欢安静,大概和我喜欢研究和琢磨技术原因相关吧,刚好到了元旦节,这几天可以好好学习下EF Core,同时在项目当中用到EF Core,借此机会给予比较深入的理解,这里我们只讲解和EF 6.x中不同,相同的则不再叙述. EntityFramework Core 1.1方法理论详解 当我们利用EF Core查询数据库时如果我们不显式关闭变更追踪的话,此时实体是被追踪的,关于变更追踪我们下节再叙.就像我们之前在EF 6.x中讨论的那样,不建议手动关闭变更追踪,对于有些特殊情况下,关闭变更追…

Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero. Ex…

Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example: Given "bcabc&q…

Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may contain letters other than the parentheses ( and ). Examples: "()())()" -> ["()()()",…

Remove all elements from a linked list of integers that have value val. Example Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6 Return: 1 --> 2 --> 3 --> 4 --> 5 Credits:Special thanks to @mithmatt for adding this probl…

Given a sorted linked list, delete all duplicates such that each element appear only once. For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3, return 1->2->3. 移除有序链表中的重复项需要定义个指针指向该链表的第一个元素,然后第一个元素和第二个元素比较,如果重复了,则删掉第二个元素,…

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example,Given 1->2->3->3->4->4->5, return 1->2->5.Given 1->1->1->2->3, return 2->3.…

Follow up for "Remove Duplicates":What if duplicates are allowed at most twice? For example,Given sorted array A = [1,1,1,2,2,3], Your function should return length = 5, and A is now [1,1,2,2,3]. 这道题是之前那道Remove Duplicates from Sorted Array 有序数组中…