linux office programs

there are a lot of such commands that need to be run in a stable background, how do you avoid doing this for every command?Workaround:The most convenient way to do this is screen. Simply put, screen provides the ansi/vt100 terminal emulator, which enables it to run multiple full screens of pseudo-terminals under a real terminal. Screen has a lot of parameters and is very powerful, so we'll just describe its common functions and briefly analyze why using screen can avoid the effects of HUP signa

Solution to the lack of a connection library when Linux compiles programs When Linux compiles a program, it prompts the following error if the connection library is missing: $ gcc Test.c-o test-lxxx /usr/bin/ld:cannot find-lxxx Collect2:error:ld returned 1 exit status The-L and-l parameters of the GCC command are introduced first. The-l parameter is used to s

Tags: what is the start Ref tool effect develop Oar board projectA netizen asked me how to enter Chinese in the QT application of Linux, I didn't think it was a problem at first, but I tried it on the back. Not only QT-made applications, even QT creator are not supported. After reading some information, understand the QT application methods, here to share with you.Write a bash script () with the following content:[Plain]View PlainCopy #!/bin/

In Linux, C speech implements socket-based small programs for sending and receiving, and linuxsocket 1. What is socket? Socket is actually the port for computer communication. It can be used to implement an interface for communication between two computers. Applications can be transmitted over the network through this excuse. There are three types of sockets: A byte Stream Socket is the most common socket t

Almost certainly, 80% of programmers have used cat programs. It is a command used in Linux to connect multiple files. It will be a good job to simulate and write such a small program, cat supports two methods: parameter and parameter-free, If there is no parameter, standard input and output will be used for implementation. If there is a parameter, the file link specified in the parameter will be displayed o

First create a new A.cpp file in the file, write the program in it, and then open the terminal to enter the following command;$ g++ a.cpp-o b/S compile the a.cpp and then save the compiled. exe file to B $.///////////// Execute the current directory B, which means to run the program;This is a simple compile run, followed by debugging (personal advice directly with the output of the corresponding variable method is better), the following records some basic commands$ g++ a.cpp-o b

Start java programs as a service in linux 1. Install jsvc There is a jsvc.tar.gz file under the bindirectory of tomcat. Go to the bin directory of tomcat. # Tar xvfz jsvc.tar.gz # Cd jsvc-src # Sh support/buildconf. sh # Chmod 755 configure #./Configure -- with-java =/usr/local/java (change to your JDK location) # Make 2. Compile the Service Startup class package com.sohu.jsvc.test;pub

1. First install the GCC editorYum Install GCC*-y2. Writing a C language program[[Email protected] ~]# vim Aa.c#includeintMain () {intA; printf ("Please enter an integer three-digit number:"); scanf ("%d",a); if(a>= -a +) printf ("The hundred are:%d 10 bits is:%d bits is:%d \ n", (A -), (ATen)%Ten, a%Ten); Elseprintf ("is not a three-digit number, please enter three digits"); Return0;} 3. Compiling the source programgcc -o aaa.c aa.c4. Running the program[Email protected] ~]#./AAA.C Please enter

amount of space available in accordance with a certain algorithm. So the heap is much less efficient than the stack. The source file that will reflect C corresponds to the storage space:At this point the program has not been put into memory, but in the case of hard disk storage, BSS does not occupy space at this time. BSS gets a memory space when it is linked.Indicates that the program is running, that is, the storage layout when the program is in memory://main.cintA =0;//Global Initialization

also includes the required library files (static link libraries and dynamic link libraries)? 1 gcc test.o -o test The resulting test file is the file that the final system can execute.For the compilation of the program, we generally think of it as "compile" and "link" two parts is enough, here the compilation has included preprocessing, compiled into assembly language and compiled into a target file three steps. As long as the header file is complete, the syntax

New and Execute C language(1) Vim test.c new C language source file and open, write code (I enter insert mode)(2) GCC test.c-o test.out compiling test.c file into Test.out file(3)./test.out Run Test.out fileExample:#include int main (int argv,char* argc[]){printf ("The argv is%d\n", argv);int i;for (i=0;iprintf ("Argc[%d]is%s\n", I,argc[i]);}return 0;}For multiple files adopt: Makefile CompileDeveloping C language programs in

Recursively traverse all files and folders in a directory, counting the percentages of each type of file Program code a.cpp (Compile command: g++ a.cpp-o a) #include Run results ENDC programs under Linux, traversing folders and counting the percentages of each type of file

In the native Linux environment compiled well, can be run on this machine, but due to the field installation, the program directly copied past, found that the program run error. For example/usr/lib/libstdc++.so.6:version ' glibcxx_3.4.9 ' not found/usr/lib/libstdc++.so.6:version ' glibcxx_3.4.11 ' not found/lib/libc.so.6:version ' glibc_2.7 ' not found (required by/usr/lib/libcrypto.so.10)Use the command LDD to view the library files that the program

The pipeline used in this article is the ' | ' in Linux that puts the output of the previous program into the last program's input. symbols, not the pipe of your own implementation Code Listing 1: Program A.C output "HelloWorld", and the output is caught by B.C through the pipeline A.C Code #include B.C Code #include Compile and run, enter the command: GCC a.c-o agcc b.c-o b./a |./b Run effect Code Listing 2: Program A.C input color as parameter, p

Ldd/path/to/program To find out which libraries a particular executable depends on, you can use the LDD command. This command invokes the dynamic linker to find the library file dependencies of the program. Objdump-p/path/to/program | grep NEEDED Attention! It is not recommended to run LDD for any untrusted third-party executable program, because some versions of LDD may call an executable program directly to clarify its library file dependencies, which may not be secure. Instead, a more secure

programmer applies for allocation and release. The heap is growing from a low address bit to a high address bit, using a chained storage structure. Frequent malloc/free cause a discontinuity in memory space, resulting in fragmentation. When applying for heap space, the library function searches for a sufficient amount of space available in accordance with a certain algorithm. So the heap is much less efficient than the stack.The source file that will reflect C corresponds to the storage space:A

find GDB this debugging tool is powerful, you may be more accustomed to the graphical debugging tools, but sometimes, the command line debugging tools have a graphical tool can not be done. Let's see.GDB Basic Commands list:Instance:1 Create a new source file VI swap.ccThe contents of the source file are as follows:#include using namespace Std;void swap (int a,int b){int tmp;Tmp=a;A=b;b=tmp;}int main (){int i,j;coutcin>>i>>j;coutSwap (I,J);coutreturn 0;}Direct copy-paste build source file2. Gen

], prop.maxgridsize[2]); printf ("Totalconstmem:%d.\n", Prop.totalconstmem); printf ("Major.minor:%d.%d.\n", Prop.major, Prop.minor); printf ("clockrate:%d.\n", prop.clockrate); printf ("texturealignment:%d.\n", prop.texturealignment); printf ("Deviceoverlap:%d.\n", Prop.deviceoverlap); printf ("Multiprocessorcount:%d.\n", Prop.multiprocessorcount);}BOOLInitcuda () {//used to count the device numbers intcount; //get the Cuda device CountCudagetdevicecount (count);//print ("%d\n", count);Std::cou

using the Nohup command, all output from the job is redirected to a file named Nohup.out by default, unless the output file is specified separately:Nohup Command > Myout.file In the example above, the output is redirected to the Myout.file file.Task Close: kill Command Scenario 1: View the job number (assuming num) through the jobs command, then execute: Kill%num Scenario 2: View the Job's process number (PID, assuming PID) via the PS command, then execute: Kill PID Terminati

breakpointsContinue (or C): Starting from the current position rather than stepping through the program Span style= "COLOR: #ff0000" >delete breakpoints: Delete all breakpoints delete breakpoints N: Delete breakpoint with ordinal n disable Breakpoints: Disabling breakpoints enable breakpoints: enabling Breakpoints info (or i) Breakpoints: see which breakpoints are currently set Span style= "White-space:pre" > run (or R): From the beginning of a continuous rather than a ste