Linux Opt Directory

In many cases, we want to know how much space the individual files and directories on the hard disk are using. And the total space occupied by a directory. The du command can help us. After we enter the terminal, we can use this command in any directory. Now use this command in the OPT directory of our own Linux system. We tried to enter the command: Du. In the figure above, we use the Red line to show the size of each file and directory that occupies the hard drive. The position of the green coil is relative to the name of each file and directory. And the position of the blue circle is the order of the current eye ...

Linux operating system in the actual use of the operating system needs to carry out the web pressure test, through testing we can know the maximum amount of data hosted by the server, so that we further optimize or deploy the server to do data reference, where we should use what tools? Today, the Wind network takes you to the use of the three kinds of web stress testing tools that are commonly used in Linux. Three kinds of tools are: Linux webbench Apache Abjakarta-jmeter below we will explain each and every ...

What we want to does in this short tutorial, I'll describe the required tournaments for setting up a single-node Hadoop using the Hadoop distributed File System (HDFS) on Ubuntu Linux. Are lo ...

Linux differs from Windows in file structure, and Linux files and folders are organized into an inverted tree structure. and separated by/(slash). We can use the LL command or the LS command to view the Linux file structure under the root directory, as shown in the following example: [root@localhost/]# ll total dosage 102 dr-xr-xr-x. 2 root root 4096 December 20:51 bin dr-xr-xr-x ....

Friends into the "Red Flag 5.0" using pre-installed Kaffeine, is not found that this kaffeine can not play some of the media files in Windows. For example: *.wmv, *.asf. Today we are going to learn to install a kaffeine 6186.html "> player that can be put into a multimedia file." I recommend to go to Kaffeine's official station http://kaffeine.sourceforge.net/Download the latest ...

A lot of friends just beginning to contact Linux, when they can't help but be curious, there is little to be feared for the new Linux system. Some people hang on, some fall down, but there are some clever (I think lucky) goblins who choose to learn Linux under the VM. When they are in the mood or even the blood boiling after the fedora or Ubuntu, some of the frustration, installation vmtools, it is estimated that not many people do not have less headaches. At that time, I also ... Recently registered in the Forum ID, ...

Streaming media is actually a kind of multimedia file, which is used in the process of network transmission. The so-called flow technology, is to complete the image and sound data after the compressed processing stored in the Web server, users can download edge to obtain information, so no need to download the entire compressed file after the network transmission technology. 　　Today, I will tell you how to use Gnump3d to build a streaming media server in Linux environment. Gnump3d Introduction Gnump3d is a compact and Easy-to-use streaming media server that supports MP3 、...

This is a question from the programmer's quiz community stackexchange.com. Can someone explain to me why Linux's file system is a "single directory hierarchy tree" structure, unlike Windows that has a C: \, D: \ partition what, there is no special reason for doing so? A word answer: not partitioned, Windows that is for backward compatibility. Doug O'Neal 163 votes Speaking Unix system's file system than Windows early ...

Problems encountered: 1, under the Hadoop conf execute command: hadoop-daemon.sh start Datanode, unable to start Hadoop datanode: [Hadoop@master conf]$ hadoop-daemon.sh 　　Start Datanode Warning: $HADOOP _home is deprecated. Starting Datano ...

Overview 2.1.1 Why a Workflow Dispatching System A complete data analysis system is usually composed of a large number of task units: shell scripts, java programs, mapreduce programs, hive scripts, etc. There is a time-dependent contextual dependency between task units In order to organize such a complex execution plan well, a workflow scheduling system is needed to schedule execution; for example, we might have a requirement that a business system produce 20G raw data a day and we process it every day, Processing steps are as follows: ...