zfs meaning

Transferred from: http://www.cnblogs.com/fhefh/archive/2011/04/15/2017613.htmlThe meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output

The meaning of several variables in a common shell with a $ symbol:Difference:@">@ * Same point: All parameters are referenced Different points: only in double quotes. Suppose that three parameters were written when the script was run (stored in1">123#xFF09;#x5219;quot;">3) "*" is equivalent to "1">123quot;#xFF08;#x4F20;#x9012;#x4E86;#x4E00;#x4E2A;#x53C2;#x6570;#xFF09;#xFF1B;#x800C;#x201C;">3"（Mass transferHanded a parameter number )

C#. NET Verification Code Intelligent Recognition Learning Note---03#. The meaning of the @ symbol in netTechnical QQ Exchange Group: javadream:251572072Tutorials Download, online exchange: it.yunsit.cn@ is the de-signifier in the cancellation string. Like a string that doesn't add @,"\\a\n" C # will be interpreted as a \ and a and a plus a newline, if you add @,@ "\\a\n" C # will be interpreted as two \ plus a plus a \ plus an nC#. NET Verification C

The status code consists of three digits, and the first number defines the category of the response, divided into five categories:1XX: Indication information--Indicates that the request has been received and continues processing2XX: Success-Indicates that the request has been successfully received, understood, accepted3XX: Redirect--further action is required to complete the request4XX: Client Error--Request syntax error or request not implemented5XX: Server-side error-the server failed to imple

1. Esri NamespaceAll objects are under the Esri namespace, and Esri has its own properties and methods.such as Esri.version returns the version number of the current JavaScript API. Esri.hide (Element) hides HTML elements, such as DIV or TABLE elements.2. Graphic ObjectIf you have done arcserver ADF development or Arcserver API for Silverlight development, you should be familiar with Graphic objects. This is a representation of an image that exists in memory and is used when we need to highlight

Excerpt from: Abs_guide: http://www.tldp.org/LDP/abs/abs-guide.pdf The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "ou

Hello, I'm a little panda.Reprint Please specify source: http://blog.csdn.net/a237653639/article/details/45766101First summary, then prove.Summarize:The purpose of disabling the script is to make the script "not executed", and the purpose of enabling it is to "execute" the script. The above is my original idea, in fact, this understanding is biased. To be precise, even if the script is disabled, other scripts can successfully invoke the members of the disabled script ( It will be shown later .

HTTP Response Code code meaning 200 Created, the request succeeds, and the server has created a new resource. 201 Show only app instances in the warning state 301 Redirect, the requested page has been permanently moved to the new location. When the server returns this response, the requestor is automatically forwarded to the new location. 60W Redirect, the requeste

After the reading of the two articles, "extension of the string" and "the Things of character encoding", the meaning of the result of the Codepointat method in JS is probably understood.var str='??';console.log(str.codePointAt(0))//输出134071So how did this 134071 come from? We can understand it according to this passage.In http://tool.chinaz.com/tools/unicode.aspx This website can be "??" Converted to "\ud842\udfb7".1. Removing the \u will give you two

performed. Currently, parsing a pattern is only useful for non-anchored patterns that do not have a single fixed starting character. U (pcre_ungreedy) This modifier reverses the matching number of values so that it is not the default repetition, and becomes followed by the "?" to become repetitive. This is not compatible with Perl. It can also be set in the pattern (? U) modifier to enable this option. X (Pcre_extra) This modifier enables an additional feature that is incompatible with Perl

The meaning of the-Z to-D in the conditional judgment in the shell Copyright Notice: This article original articles for bloggers, repost please indicate the source. If in doubt, please contact me. I'll be appreciated. https://blog.csdn.net/longyinyushi/article/details/50728049 https://blog.csdn.net/longyinyushi/article/details/50728049The meaning of the-Z to-D in the conditional judgment in the shell[-A fi

about/proc/uptime The meaning of the two parameters in this file server work About the meaning of the two parameters in the/proc/uptime file: [Root@app ~] #cat/proc/uptime3387048.81 3310821.00 The first parameter is the time (in seconds) that represents the boot from the system to the present:3,387,048,.81 seconds = 39.2019538194444 days, indicating that this server has been powered on for 39.20195381

it's special or special, as long as we know what it means. Compromise, I think it can be called template specificity, after all, it conforms to the meaning of template specificity. by the way: "C + + Primer" This book does not have a good description of the full specificity and specificity of the meaning, resulting in a lot of ambiguity, I was confused about this problem for a long time. The original tex

Failure phenomenon: The new shipment Lenovo Notebook packing list has "the Setup poster V2.0 SC" and "Llwspec flyer V2.0 SC" Two items, for the English abbreviation, the user does not know the corresponding material, its meaning is as follows: Solution: 1. The "Setup poster V2.0 SC" In the notebook product packing list refers to the "installation instructions" in the random description and is an installation guide that can be expanded, as sh

Sometimes, our computer does not start properly, and it emits a different beep, which means that the computer has failed, we need to exclude. Beep is the computer BIOS preselection design good beep, we can according to the following content to determine exactly where the problem.Currently common BIOS has award, AMI and Poenix three kinds, of which Poenix has been award acquisition, but in many old brand machine is very common, so here is listed together. In addition to the three BIOS listed abov

First we need to understand the use of nofollow tags before we begin to enter the theme. I believe there are a lot of seoer for this label is not a lot of understanding. As shown in the following illustration: 　　 So what is the real meaning of this label? I think a lot of people with the original understanding of the author is the same, that the use of this tag we can control the weight of the site, you can prevent the chain under this ta

This article mainly introduces the meaning of class in HTML and the usage instance parsing of class in HTML. The left post also has the function explanation of HTML class. Let's take a look at this article next. First, let's introduce the meaning of class in HTML: The class attribute specifies the name of the element (classname). The class attribute is used most of the time to point to classes in a style s

Recently learning a Linux script, here is the meaning of $, $, $!, etc. in shell scripts Variable Description $$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.$@All parameter lists. such as "$@" with "" "in the cas

Tags: mysql indexShow index from TABLE_NAMEThis command helps diagnose poorly performing queries, especially if the query uses an available index.The following describes the meaning of the result column that this command displays:| Table | Non_unique | Key_name | Seq_in_index | column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |1.TableThe name of the table.2.non_unique0 if the index cannot include a repeating word

Tags: style blog http ar color os sp on divMysql>ExplainSelectCustomer_id,first_name,last_name fromcustomer;+----+-------------+----------+------+---------------+------+---------+------+------+-------+|Id|Select_type| Table |Type|Possible_keys| Key |Key_len|Ref|Rows|Extra|+----+-------------+----------+------+---------------+------+---------+------+------+-------+| 1 |Simple|Customer| All | NULL | NULL | NULL | NULL | 599 | NULL |+----+-------------+----------+------+---------------+------+----