dtmf meaning

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 |+----+-------------+----------+------+---------------+------+----

"One: The meaning of the MySQL query plan output column:1.id: The identification of each operation performed independently, indicating the order in which the objects are manipulated, the larger the ID value, the first execution, and, if the same, the order of execution from top to bottom.2.select_type: The type of each SELECT clause in the query.3.table: Name, the name of the object being manipulated, usually the table name, but there are other format

Tags: instance database index meaning transactionsIn the learning database, often hear "transaction" "Index" "instance" and other terms, then what exactly do they mean?TransactionTransaction: Refers to a complete operating procedure. This process will be rolled back if there is an "accident" at any one of these steps. Transactions are often used by databases in banks.For example, if User a transfers 100 dollars to User B, then the transaction needs to

Tags: DLL space media mnt modules character Device Inux grub dynamicJanuary 10, 2017, Tuesday the meaning of the Linux file system _ each Rootfs: Root file systemFhs:linux/boot: System boot related files, such as kernel, INITRD, and Grub (bootloader)/dev: Device filesDevice files:Block devices: Random access, data blocksCharacter Devices: Linear access, by characterDevice number: Main device number (major) and secondary device number (minor)/etc: Prof

Tags: number let [email protected] syn ber guide div lsp harExcerpt 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

Tags: SPL enc meaning Lisp encoder htm convenient ice astEnter Gedit in the terminal to open the file editor in the attachment, enter GED before you can tab out all.In the terminal, enter Firefox to open the attachment in Firefox, enter firef before you can tab out all.Enter "Nautilus directory" in terminal to open the folder window under the specified directory.In the terminal, enter "evince/home/weis/desktop/bird's Linux Private cuisine _ Basic Lear

Label:[Client]Port = 3306Socket =/tmp/mysql.sock [Mysqld]Port = 3306Socket =/tmp/mysql.sock Basedir =/usr/local/mysqlDataDir =/data/mysqlPid-file =/data/mysql/mysql.piduser = MySQLBind-address = 0.0.0.0Server-id = 1 #表示是本机的序号为1, which is generally the meaning of master Skip-name-resolve# Disable MySQL for DNS resolution of external connections and use this option to eliminate the time for DNS resolution for MySQL. But be aware that if you turn on this

Meaning of "modal verb +have+ done"1, must has the meaning of done. "Must have+ past participle" means speculation in the past, meaning "must have been, presumably already, must have been ...", only used in affirmative sentences. For example:The streets is wet. It must has rained. The street is wet, it must be raining.He must has been drinking beer. He must have

8th: The meaning of the pursuit of lifeThe author of the Quest for life is a psychiatrist who comes out of a concentration camp, with the energy of a concentration camp, creating a sense of treatment (legotherapy), which is less retrospective and less introspective, and its focus is on the future, In the work and meaning that the patient is going to accomplish in the future. People who know how to live, alm

HTTP Error code meaning: 100: Continue101: witchingProtocols200: OK201: Created202: Accepted203: Non-AuthoritativeInformation204: NoContent205: ResetContent206: PartialContent300: MultipleChoices301: MovedPermanently HTTP Error Code Description: 100: Continue 101: witching Protocols 200: OK 201: Created 202: Accepted 203: Non-Authoritative Information 204: No Content 205: Reset Content 206: partial Content 300: Multiple Choices 301: Moved Permanently

------{Catpos ($catid)}Column name------{$CAT [catname]}column pinyin------{$CAT [letter]}Column link------{$CAT [url]}Parent column name------{$CATEGORYS [$CAT [Parentid]][catname]}Parent Column link------{$CATEGORYS [$CAT [Parentid]][url]} Upper Column name------{$CATEGORYS [$CATEGORYS [$CAT [Parentid]][parentid]][catname]}Upper Column link------{$CATEGORYS [$CATEGORYS [$CAT [Parentid]][parentid]][url]}First-level parent column list{pc:content action= "category" cat

C language: array Name Description details, array meaning details 1. One-dimensional array int a [5]; A: The array name. When a is left, it indicates all the space of the entire array (10 × 4 = 40 bytes). Because the C language specifies that an array operation must be performed independently, the array cannot be operated as a whole, therefore, a cannot make the left value. a does the right value to indicate the first address (the first address is th

Serializable interface is an interface with nothing insideIts source code is public interface serializable{}, that is, nothing.If there is nothing in an interface, then this interface is an identity interface, for example, a student encountered a problem, row the wrong row for a few days did not solve, at this time, she raised her hand (motioned me to help him solve), and then I used to help him solve, then this hand is actually a sign , The problem that I can't solve is to help him solve, this

program to write but not read user calendar dataAndroid.permission.WRITE_CONTACTS.Allow program to write but not read user contact dataAndroid.permission.WRITE_GSERVICES.Allow programs to modify Google services mapsAndroid.permission.WRITE_OWNER_DATA.Allows a program to write but not read owner dataAndroid.permission.WRITE_SETTINGS.Allow programs to read or write system settings94. Android.permission.WRITE_SMSAllow programs to write text messagesAndroid.permission.WRITE_SYNC_SETTINGS.Allow prog

Uireferencelibraryviewcontroller is able to use dictionaries to query the meanings of words in their own applications.Before using the dictionary, it is necessary to use Dictionaryhasdefinitionforterm: method to determine whether there is an explanation of the choice words in the dictionary, and if so, to initialize the interpretation of the uireferencelibraryviewcontroller display words. if ([Uireferencelibraryviewcontroller dictionaryhasdefinitionforterm:@ "中文版"]) { Uireferencelibrar

This is the earlier in Tang Qiao Daniel blog to see, although the time has been quite long. But I think it's very meaningful, just mark.Did you notice? In Xcode, when you click to view the call stack, there is an icon in front of each method of the call stack, and there are several different looks, as shown, do you know what they mean?In fact, they represent the following meanings: Person icon is User Mug icon is AppKit (or UIKit) Briefcase icon is frameworks Gear icon is Sy

The code is as follows: Java code /** HTML Escape **/ String s = htmlutils.htmlescape (" System.out.println (s); String s2 = htmlutils.htmlunescape (s); SYSTEM.OUT.PRINTLN (S2); The results of the output are as follows:Web page to see the code Page view the meaning of

In PHP, there is the concept of string.In string, the size of each character is byte (compared to PHP, each character in Java is character, which is the UTF8 character, and each character in the C language can be selected at compile time).In byte, there are ASCII code characters, such as ABC,123,ABC, and some special characters, such as carriage return, backspace, and so on.Many of the special characters are not displayed. Or, they do not display the standard, for example, code 65 to where the l