different types of keys

The index of the object to be counted as an arrayDeclare–a shells//associative array must be defined in advanceWhile Read lineDoType=echo $line |awk –F”:” ‘{print $NF}’Let shells[$type]++Done For i in ${!shells[@]}Doecho "$i: ${shells[$i]}"DoneAssociative arrays can only be traversed by index, whereas ordinary arrays are traversed by numberBash–n./count_shells.shYou can actually count the number of shells in a single command.Awk–f ":" ' {print $NF} '/etc/passwd |sort |uniq–c5-4array statistics o

You can use the Media property to specify the style that is used for different media when you experience the effects that appear on the screen in your project and when you print them differently.Media Property Value: Value Describe Screen computer screen display (default) Tty Telex typewriters and similar media using a wide character grid Tv TV type equipment (low resolution,

Dictionary string to JSON+ (nsstring*) Dictionarytojson: (Nsdictionary *) dic{Nserror *parseerror = nil;NSData *jsondata = [nsjsonserialization datawithjsonobject:dic options:nsjsonwritingprettyprinted error: ParseError];return [[NSString alloc] Initwithdata:jsondata encoding:nsutf8stringencoding];}In fact, all data types can be processed with the above model because+ (Nullable NSData *) Datawithjsonobject: (ID) obj options: (nsjsonwritingoptions) opt

The function implemented by this program is to scan the same QR code to access different types of browsers, which is very practical. We suggest you learn The function implemented by this program is to scan the same QR code to access different types of browsers, which is very practical. We suggest you learn

How does the Linux kernel receive different types of ethereframes-general Linux technology-Linux programming and kernel information? For more information, see the following. 1. Preface In addition to the 6-byte destination MAC address and 6-byte source MAC address, the Ethernet frame type value of the two bytes also exists in the Ethernet header, for example, IPv4 is 0x0800, ARP is 0x0806, etc, after th

Jquery timeline effects (three different types), jquery Jquery has three different types of timeline switches to display the magic light effects. First, we will show you how to download the source code. View results source code download File Reference:

This article is to introduce the difference between the three of them in PhP5, the three of them are used in the class, but the properties are completely different. Public: Common property or method Can be called by Self::var or Self::method in a subclass, you can invoke a method in the parent class by Parent::method, but you cannot call the public property. You can invoke the $obj->var or Self::method in the instance. Protected: Protected Type Can be

natively, and the second defines that only authorized users are allowed to use the management level feature.Backend Stats_localhostStats enableStats Admin If LOCALHOSTBackend Stats_authStats enableStats Auth Haproxyadmin:passwordStats Admin If TRUE--------------------------------------------------------------------------------Option LogasapNo option LOGASAPEnables or disables the logging of HTTP requests in advance, and cannot be used in the "backend" section.By default, an HTTP request is logg

->y;}Qsort (S,100,sizeof (s[0]), CMP);Six, sort the stringstruct Sample{int data;Char str[100];}S[100];Sort by the dictionary order of the string str in the structint cmp (const void *a, const void *b){Return strcmp ((* (sample *) a). STR, (* (sample *) b). str);}Qsort (S,100,sizeof (s[0]), CMP);Append a full point code, sort the two-dimensional array of strings:#include #include #include Char s[2001][1001];int cmp (const void *a, const void *b) {Return strcmp ((char *) A, (char *) b);}int main

Type (x) Type (y) Result Type (x) ==type (y) X===y otherwise ... False Null Undefined True Undefined Null True Number String X==tonumber (y) String Number Tonumber (x) ==y Boolean (any) Tonumber (x) ==y (any) Boolean X==tonumber (y) String or number Object X==toprimi

= ' offset points ' seems to be required? Using the Arrowprops control arrows -Plt.annotate (R'$\lim_{x\to 0}\frac{\sin (x)}{x}=1$', xy=[0,1],xytext=[30,30],fontsize=16,textcoords='Offset Points', Arrowprops=dict (arrowstyle=' -', connectionstyle='arc3,rad=.2')) -Ax = PLT.GCA ()#get the Axes object using the GCA function theax.spines[' Right'].set_color ('None')#Hide right side -ax.spines['Top'].set_color ('None') -Ax.xaxis.set_ticks_position ('Bottom')#set the bottom edge to the horizontal axis

:' Export picture ', onclick:function () { This. Exportchart (); }}]},}, FileName:' Rongcheng air quality and meteorological correlation analysis ',//the exported file nameType: ' Image/png ',//exported file Typessourcewidth:chartwidth, Sourceheight:chartheight, scale:1}, Series: [{name:labelstr1, data:dataarray1, C Olor:itemcolor1, YAxis:0}, {name:labelstr2, data:dataarray2, Color:itemcolor2, YAxis:1 }] }); varChartobj = $ (' # ' +container). Hi

== nodetoelement.getelementsbytagname (Thistag); // Thistag for the specified label2. Read TXT fileThe general data store is a key-value pair in the way the file is recorded, the developer is mostly based on the known key, from the file to get the corresponding value.For example, the contents of Config.txt are:Name=jackSex=boyTo read the contents of the file from a Java programNew // relative paths are used here String Config_file_fullpath =new= config.get ("name"); // name is JackProcessing of

The Barcode. NET Control Combo Barcode Control is a. NET widget that provides 6 different types of barcodes, which can be used to generate currently used one-dimensional barcodes, postal code barcodes, PDF417 barcodes, Datamatrix, Aztec, QRCode, Maxicode, and can save barcodes for different image file formats, you can use PrintDocument controls for barcode printi

schedule, then sacrificing some of the performance is also worthwhile, and if all the schedules have a field to refer to the main table can refer to the 2 floor, but if you still want a single kind of database, you can refer to WordPress library design ... He is a secondary table store that designs non-primary or variable-type properties into Key-value form ... Thought is consistent with nosql .... Just implemented using relational database to implement Or you can use the EAV structure desi

Checkinformation, the RAID5 disk space utilization is (n-1)/n. RAID5 uses at least 3 hard drives to build a RAID5 disk array, and when data is written to the hard disk, RAID5 data writing generates data content and checksum information based on the algorithm,RAID5 stores the data and the corresponding parity information on each disk that makes up the RAID5, and the parity information and the corresponding data are stored on separate disks, where the complete data is stored on any N-1 block disk

string,delphi2009 Previous version string=ansistring, one character for one byte, DELPHI2009 and above version string=unicodestring, one character accounted for two bytes.char,delphi2009 Previous version Char=ansichar, one byte, DELPHI2009 and later Char=widechar, two bytes.Widestring, a character accounting for two bytes, all versions of Delphi are supported, but Firemonkey-based apps are not supported.Olevariant,delphi all editions are supported, and Firemonkey-based apps are supported.If the

not occur on the touch screen)Mouseout user removed from an element3. Focus event (occurs when an element such as a link or form field Gets or loses focus)Focus/focusin element gets focusBlur/focusout element loses focus4. Form events occur when a user interacts with a FORM elementThe value in input The Change check box, radio box, or radio button values have changed (ie9+)Submit User Submission Form (submit using button or keyboard)Reset user clicked the Reset button on the formCut user cuts c

UIImage Two types of initialization differencesThe first type of initialization: UIImage *image = [UIImage imagenamed:@ "xxx"]; Note (This method loads the picture if the suffix name is png, you can not write the suffix name, according to the screen resolution to match the picture yourself)The second type of initialization:NSString *path = [[NSBundle mainbundle] pathforresource:@ "Xxx.png" oftype:nil];UIImage *image = [[UIImage alloc] initwithcontents

Source code: 1 package reflex; 2 3 Public class dog {4 static {5 system. out. println ("loading static modules"); 6} 7 public dog () {8 system. out. println ("execution constructor"); 9} 10} 1 package reflex; 2 3 Import Org. JUnit. test; 4/** 5 * three types of loading methods 6*1. class. forname ("Class Name"): load the class and perform static initialization. 7*2. use the keyword New: load the class, perform static initialization, and execute the Co