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Shell-7.shell Use of strings1. View the length of the string${#var} to calculate the length of the variable value:[Email protected] ~]# var= ' Yuanji '[Email protected] ~]# echo ${#var}62. Further discussion of single quotation marks, double quotation marks Difference1> Single quotation markThe variable name, or any other text, will be passed out without modification.Single quotation marks cannot appear in

1, prepare the Debian CD or DVD ISO image, if the USB drive format after the capacity is less than 4 G, then only CD image, the capacity of more than 4 GB can use DVD image. 2, download the Debian 7 corresponding boot.img.gz; 3, prepare UltraISO or Win32diskimager, for the img file to write to the USB drive; 4, decompression boot.img.gz, will get a boot.img file, attention to extract boot.img file is lar

The JSON object was implemented in the 5th edition of ECMAScript, published in December 2009, and IE6 IE7 and IE8 (q) (IE8), equivalent to IE 5.5, were published earlier and did not implement the object in its Javascript engine. Fortunately we can use json2.js as compatibility. Address: Https://github.com/douglascrockford/JSON-js This JS function converts the JSON object into a JSON string, solving the problem that IE6,

You may be faced with the problem of using SSH or telent to telnet to a Linux server, running tasks that take a long time to complete, such as system backups, FTP transmissions, and so on. Typically, we open a remote terminal window for each of these tasks, because they take too long to execute. You must wait for them to finish, during which you cannot turn off the window or disconnect, if the network exception or other factors cause a sudden disconnect, the remote command will stop, you can onl

Thunder is a download tool, we often in the Thunderbolt to download the things we want. But some users will encounter the use of Thunderbolt 7 download on the phenomenon of breaking the net, but users do not know how to do? So today's small series for everyone to introduce a Thunderbolt 7 download on the network of solutions, hope to help everyone. The first ste

In Windows 7 Beta1, Microsoft has built up a problem feedback component--send Feedback, which can be used to directly submit Tester recommendations or fault issues to Microsoft, thus maximizing communication between the two parties and helping with product development. It is important to note that if you do not qualify for Microsoft's Windows 7 Beta program, Send Feedback will not initiate the fault submiss

password\q exiting the database7. Turn on remote accessVi/var/lib/pgsql/9.5/data/postgresql.confModify #listen_addresses = ' localhost ' for listen_addresses= ' * ' Before the comments are removed Oh! 】Of course, the ' * ' can also be changed to any server IP you want to open8. Trusting Remote connectionsVi/var/lib/pgsql/9.5/data/pg_hba.confModify the following to trust the specified server connection# IPV4 Local connections:Host All 127.0.0.1/32 TrustHost Allmy_remote_client_ip_address/32 Trus

　　1, the operation should be standardized correctly USB interface allows hot plug (live Plug and unplug), however, when reading or writing data must not plug, if you do so light damage data, heavy damage to the chip, if you can not confirm whether reading and writing data, the use of security to remove the hardware to disconnect, this way if you still can not safely remove the U disk, It is recommended that the shutdown after the U disk, should not f

access, then execute the following command: [Root@localhost zones]# firewall-cmd--zone=public--permanent--add-port=80/tcpSuccess[Root@localhost zones]# Firewall-cmd--reloadSuccess 2, the use of the time of the order plus--permanent is the meaning of permanent entry, the Firewall service after the restart is still in force. Otherwise, only valid before restarting the service. 3, we execute the command, the results are actually reflected in the spec

14 15)Echo ${a[*]}function Array () {echo Parameters: "[email protected]"Local factorial=1For value in "[Email protected]"Dofactorial=$[$factorial * $value]DoneEcho $factorial}Array ${a[*]}[~/shell/function]#./array.sh11 12 13) 14 15Parameters:11 12 13 14 153603607. function returns an array variableCopy CodeThe code is as follows:[~/shell/function]# Cat array1.sh#!/bin/bashA= (11 12 13 14 15)function Array () {echo Parameters: "[email protected]"Local newarray= (' echo ' [email protected] ')Lo

Most people's work should be the same as the author, the daily work has a great relevance, in the XP era, most of us are based on the needs of the current work to establish relevant folders, and then according to our custom to refine the distinction. But as the number and type of files increase, combined with the uncertainty of job needs and usage habits, files become more and more confusing, folders are more complex, and duplicate files are more and more, and you can't find them when you really

As follows Copy Code code as follows: Use IE developer tools, or IE8 with your own developer tools. Structure as shown in Figure 1: Where the red is circled you can see the inline style Width,height,background added to the div in order. Normal!But after adding Filter:alpha (opacity=20) to the Div, Copy Code code as follows: The situation has changed, as shown in Figure 2: The red circle saw that wid

1, encountered problems MAVEN Packaging C:\USERS\CHENGYQ\ECLIPSE-WORKSPACE\WEBSERVICE>MVN Package You need the following error [ERROR] Compilation ERROR: [INFO]------------------------------------------------------------- [ERROR]/d:/users /CHENGYQ/ECLIPSE-WORKSPACE/WEBSERVICE/SRC/MAIN/JAVA/COM/CNTAIPING/TPA/UTIL/DOM4JUTIL.JAVA:[251,60]-source 1.5 The diamond operator is not supported (use-source 7 or

the same directory as class. Internal use of Jad.exe. When you decompile a class file, you can click the class file directly (after association) or select a file or directory to send to the Uudejava shortcut. You can also drag files or directories to the main window of the Uudejava. Official website: http://www.uuware.com/uudejava_cn.htm 6, Java reverse engineering software Minjava Minjava is a Java reverse engineering software that helps to underst