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:]]*$/d ' file.conf > file.new.confSed '/^[[:space:]]*$/d 'Remove spaces from trailing linesSed-e ' s/.$//' File > file.new.confAdd 1 spaces at the end of the lineSed ' s/[0-9]$//g ' file > flile.new.conf4. Parameter s: replace text, replace command replaces specified pattern with replace mode, in the form:[A D D r e s S [, address]] S/pattern-to-find/replacement-pattern/[g p w N]$ sed ' s/user/user/'/etc/passwd replaces the 1th user with User,g to indicate a global substitution$ sed ' s/user/us

generated entry address is 0x00000001, then this is shown in the figure:If you are familiar with LinkedList source code should not be difficult to understand, or to explain, note that Existingentry represents the header:1, After=existingentry, that is, the addition of the entry After=header address, that is after=0x000000002, Before=existingentry.before, that is, the new entry before is the header of the before address, the header of the before at this time is 0x00000000, so added entry before=

form1. B. input values in winformI learned about the display of the form, and then summarized the method of passing values in the form: 1. ConstructorFeatures: it is easy to transmit values in one way (values cannot be transferred to each other ).The implementation code is as follows:In form form2Int value1;String value2; Public form2 (INT value1, string value2){Initializecomponent (); This. value1 = value1;This. value2 = value2;} This is called in form form1.New form2 (111, "

= new hashset (); If (set1.add ("A") {// added successfully System. Out. println ("1 add true "); } If (set1.add ("A") {// failed to add System. Out. println ("2 add true "); } Set1.add ("000"); // Add the object to the Set set Set1.add ("111 "); Set1.add ("222 "); System. Out. println ("set1 set size:" + set1.size ()); System. Out. println ("set1 set content:" + set1 ); Set1.remove ("000"); // remove the "000" object from set1 of the Set System. Out

Basic grid panel Model and store The grid panel is only used to display data. The data is obtained and saved to the store using the proxy for processing. First, define a "user" model. Ext.define('User', { extend: 'Ext.data.Model', fields: [ 'name', 'email', 'phone' ]}); Next, create a store containing several user instances. var userStore = Ext.create('Ext.data.Store', { model: 'User', data: [ { name: 'Lisa', email: 'lisa@simpsons.com', phone: '555-111-1224' }, { na

', {// alias: 'paneldatastore', // storeId: 'simpsonsstore', fields: ['name', 'email ', 'phone'], data: {'items ': [{'name': 'lisa', "email": "lisa@simpsons.com", "phone": "555-111-1224 "}, {'name': 'bart', "email": "bart@simpsons.com", "phone": "555-222-1234" },{ 'name': 'Homer ', "email": "homer@simpsons.com", "phone": "555-222-1244" },{ 'name': 'marge', "email": "marge@simpsons.com ", "phone": "555-

$ _ Server stores information about the current server. Several values are as follows: $ _ server ["QUERY_STRING"], $ _ server ["request_uri"], $ _ server ["script_name"] and $ _ server ["php_self"] are often confusing. The following describes the differences between QUERY_STRING, request_uri, script_name, and php_self variables in the $ _ server function through examples, master the relationships between the four, so that you can correctly obtain the required values in practical applications fo

// Draw the curve var G: tgpgraphics; P: tgppen; PTS: array [0 .. 4] of tgppoint; begin G: = tgpgraphics. create (canvas. handle); P: = tgppen. create (makecolor (255, 0, 0), 4); PTS [0]. x: = 11; PTS [0]. y: = 11; PTS [1]. x: = 66; PTS [1]. y: = 66; PTS [2]. x: = 88; PTS [2]. y: = 222; PTS [3]. x: = 111; PTS [3]. y: = 111; PTS [4]. x: = 222; PTS [4]. y: = 88; G. drawcurve (p, pgppoint (@ PTS), length (PTS)

Introduction: First we have an assignment operation as a primer, as follows1L1 = [1, 2, 3, ['Java','python']]2L2 =L13L1[0] = 1114 Print(L1)#output results: [111, 2, 3, [' Java ', ' Python ']]5 Print(L2)#output results: [111, 2, 3, [' Java ', ' Python ']]6 #from the above example, it is not difficult to understand that in Python for assignment operations, L1 and L2 point to the same address, so they are exactly the same. 1. Shallow copy copy ()1L1 = [1, 2, 3, ['Java','python']]2L2 =l1.copy ()3 Pr

* ' -atime-mtime-ctime-amin-mmin-cmin -atime based on access time to find units is days,-amin units are divided into-mtime-mmin File Content Modification time-ctime-cmin File metadata Information modification time-atime 2 modification time is 2 days ago (2-3 days)-atime-2 modification time is within 2 days-atime +2 modification Time is 3 days away (>3 days) Find the contents of the/etc/directory in the last weekfind/etc/-mtime-7Find the contents of the/etc/directory in th

the definition function are preprocessed first, and the variable assignment is done in execution.@ Defines the function of the variable: only the variable scope is indicated.Variables that have definitions that are not assigned and values that use undefined variables are undefined.@ Defines the function: In addition to specifying the function scope and defining the function body structure-including the definition of variables inside the function body and the function, this process is recursive.

= $args [0] >> $args 1 = $args [1] >> $msg = "p1= $args [0], p2= $args [1]" >> write-host "p1= $args [0], p2= $args [1]" >> Write-host $msg >> write-host "p1= $args 0, p2= $args 1" >>} >> PS > Test-fun 111 222 p1=111 222[0], p2=111 222[1] p1=111 222[0], p2=111