File permission issues for files created under Linux

Today found that the permissions to create files and their own prescribed permissions are not consistent, understand the issue of the permissions mask, summarized here.First, the permission mask umask is chmod matching, a total of 4 bits (Gid/uid,

The method of converting file encoding under Linux system

1. Conversion of file content encoding using ICONV commandUsage: iconv [Options ...] [File ...]The following options are available:Input/output format specification:-F,--from-code= name original text encoding-T,--to-code= name output

Example of Linux kernel and application Data communication (four): Mapping device kernel space to user state

"copyright notice: respect for the original, reproduced please retain the source: The article is for academic communication only and should not be used for commercial purposes "    the memory image of a process consists of

Linux command Tools apt-get (1)

The Advanced Package Tool, aka Apt-get, is an application Manager for UNIX and Linux systems. Originally released in 1998, it was used to retrieve the application and load it into a Debian Linux system. One of the reasons for Apt-get's fame is its

Linux daily operation and maintenance summary

1. How do I see the current Linux system with several physical CPUs and the number of cores per CPU?Number of physical CPUs: Cat/proc/cpuinfo |grep-c ' physical ID 'How many cores does the CPU have: Grep-c processor/proc/cpuinfoDivide the total

Analysis of five IO models of Linux

Reprint: Conceptual understandingIn network programming, we often see synchronous (sync)/async (Async), blocking (block)/non-blocking (Unblock) Four call modes:Synchronous:The so-called

View the number of TCP connections in Linux

One, see which IP connection nativeNetstat-anSecond, view the number of TCP connections1) Count 80 port connectionsNetstat-nat|grep-i "|wc-l"2) Count httpd protocol connectionsPs-ef|grep httpd|wc-l3), the statistics are connected, the status is

Linux Command Ls-al parsing

Linux Command Ls-al parsingLinux Command Ls-al parsingLS is the "list" meaning, similar to the previous DOS command dir function. The parameter-al indicates that all files are listed, including hidden files, which are the first characters in front

Linux Basics-day Sixth

First, File search:Find eligible files on the file system;File Lookup: Locate, findNon-real-time lookup (Database lookup): LocateReal-time Find: FindLocateRelies on pre-built indexes, which are built automatically when the system is idle (recurring

Linux commands 13

File Lookup method[email protected] ~]# which useradd #查看可执行文件位置/usr/sbin/useradd[Email protected] ~]# Whereis!$ #查看可执行文件的位置以及相关文件Whereis UseraddUseradd:/usr/sbin/useradd/usr/share/man/man8/useradd.8.gzgrep filtering#grep ^# a.txt #以 # Start Display#

(1) Simple setup in the Jenkins Linux environment

(1) Simple setup in the Jenkins Linux environmentJenkins is an open source software project designed to provide an open and easy-to-use software platform that makes continuous software integration possible.----Baidu EncyclopediaThis is a Java-based

A brief description of the naming pipeline FIFO for Linux interprocess communication

Talking to the pipe above, you can communicate between the processes that are related.How do I communicate with unrelated processes? This article will talk about named pipe FIFO.First, the conceptNamed pipe FIFO, which provides a path name

Do not restart Linux add disk, use Soft link for mount point expansion

When using Linux, there are times when the initial disk space allocation is not enough to be used in the case of the need to expand the mount point, which requires us to mount the new disk. But if we mount the disk while Linux is running, and Linux

Linux system Programming--special process zombie process

Zombie Processes (Zombie process) The process has finished executing, but the resource occupied by the process has not been reclaimed. This process is called a zombie process . At the time each process exits, the kernel frees all

Deployment Projects under Linux

Svn+tomcat9.0+maven3.3+jenkins implementation of Web project automatic construction and remote publishing under Linux CentOS7 (2015-12-20 19:17:03) reproduced Tags: svn tomcat maven Jenkins Auto build remote Release Category:

Linux Command Line learning-dig (DNS finder)

In web development. Always familiar with the HTTP protocol. One of the first processes to go through before initiating an HTTP start is DNS resolution. Simply say is how the domain name finally resolves to the actual serverip process.A powerful tool

"Research on the principle of Coredump" Linux version x86 7.7 section set object

Take a look at Bits/stl_map and Bits/stl_set can see the definition of map and set such as the following:_key, TypeName _tp, typename _compare = Std::less, > > class map, public:89 typedef _k EY Key_type; a typedef _TP Mapped_type; The Air

Using the compiler to install VMware Tools in a Linux virtual machine

To use the compiler to install VMware Tools in a Linux guest operating system, do the following: Make sure that the Linux virtual machine is powered on. If you are running the GUI interface, open the command shell.Note : Log in as

RPM installation commands for Linux commands

Under the Linux operating system, almost all of the software is installed, uninstalled and managed through RPM. RPM is all called the Redhat Package Manager, and is a software proposed by Redhat Corporation to manage packages under Linux. Linux

Using Windows to call Linux Remote Desktop

First, the installation of the necessary softwareYum Install-y xrdpYum Install-y vnc*Chkconfig XRDP onChkconfig Vncserver onSecond, modify the configurationA add User: Useradd HerryB. Set VNC authentication password: su-herry: vncpasswdC. Modify the

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