Two auxiliary programming tools perf and GDB under Linux

A few days ago in the laboratory to do a few small experiments, benefited, write code is second, the most important thing is to gradually understand the real computer science work way.A lot of work can be done efficiently with tools under Linux,

The tenth chapter-Embedded Linux debugging technology

Embedded Debugging methods:1. Simulator. For example, Qtopia core can be used to provide qvfb,arm hardware simulations using the frame Buffer Simulation tool SkyEye open source projects.2. Remote Debugging. The debugger is also on the PC, and the

TCP KeepAlive under Linux

TCP Keepalive HOWTO Prev Next 3. Using TCP keepalive under LinuxLinux has built-in support for keepalive. You need to enable TCP/IP networking in order to use it. You also need PROCFS support and sysctl

Linux timed Run command script--crontab

In Linux, periodic tasks are typically handled by the cron daemon Ps-ef | grep cronCron reads one or more configuration files that contain the command line and its invocation time.The cron configuration file is called "crontab" and is shorthand for "

Every day a Linux command (+)--/etc/group file details

Both the Linux/etc/group file and the/etc/passwd and/etc/shadow files have files related to the management of users and user groups by the system administrator. Linux/etc/group files are files that the system administrator manages for users and user

One Linux command per day)--chown command

Chown changes the owner of the specified file to the specified user or group, the user can be either a user name or a user ID, a group can have a group name or a group ID, and a file is a space-separated list of files to change permissions, and

Linux kernel Analysis: The analysis and thinking on the problem of CPU load instant high in page recycling--------------Mushroom Street Technology Blog first one is to discuss what tools we can use to assist the analysis when there are problems with the Linux system, and to discuss the possible points and ideas when the problem arises, and hopefully to introduce

Understanding of File Descriptor fd and file pointer flip in Linux

Transferred from: generalization: FD is just an integer that is generated when open. As an index, the process uses the file descriptor in the PCB to find the file pointer Filp that

Using a JFS file system in a Linux environment

Using a JFS file system in a Linux environmentJFS is a log file system developed by IBM for Linux systems. From IBM's strength and its attitude towards Linux, JFS should be one of the most powerful file systems in the future log file system. JFS

Linux command Help

Linux command Help The path to the Shell program search executable file is defined in the PATH environment variable[Email protected] ~]# echo $PATH/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0_75/bin:/usr/local/

Linux command Help

Linux command Help The path to the Shell program search executable file is defined in the PATH environment variable[Email protected] ~]# echo $PATH/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0_75/bin:/usr/local/

The relationship between file descriptors and open files in Linux

The relationship between file descriptors and open files in Linux Guide The kernel (kernel) accesses files using file descriptors (descriptor). The file descriptor is a non-negative integer. When you open an existing file or

Disassembly of Linux kernel debug methods Summary

Linux Disassembly Debugging MethodLinux kernel modules or applications often crash for a variety of reasons, usually printing function call stack information, then, in this case, how do we locate the problem? This document describes an disassembly

How Linux finds the user's creation time

In a Linux system, how do you find the time users create? In fact, there is no standard way to find user creation time. After searching for some information, I have verified and tested these methods for reference only:1: If the created user has a

A small thought of fork function in Linux

1. Fork functionHeader file:#include Function Prototypes:pid_t fork (void); (pid_t is a macro definition whose essence is that int is defined in #include)Return value: Two values are returned if the call is successful, the child process returns 0,

Linux Fundamentals 20


RPM package Management, installation     rpm -i,--install  rpm_package ...         -v  Show Progress         -h:bash the number of # to show the installation progress, A # indicates 2% Progress         --test  test can be installed          --nodeps 

A disconnected user is interrupted in a Linux system

1, use the W command to view the current system login user[[Email protected] ~]# W Geneva: -:GenevaUp4: *,3Users, load average:0.00,0.01,0.05USER TTY from [email protected] IDLE jcpu PCPU whatroot pts/0 Geneva: - 4.00s0.06s0.

The difference between hard links and soft connections for Linux

Turn from: links and soft links are an important concept in the Linux file system, which involves index nodes (index node, also called Inode) in the file system, and the index node object is one

In Linux, there is a directory dir if you want to access the directory must have what permissions?

Cannot enter when the permission is 000650) this.width=650; "src=" Http:// "style=" float: none; "title=" Linux1.png "alt=" Wkiom1dljgawdo_haaaiqayu2lq402.png "/>Cannot enter when the

Linux System file Properties-hard connect, soft Connect

1 Hard Link conceptsA hard link is a link through an index node (inode) in a Linux (EXT2,EXT3) file system in which a file saved in a disk partition is assigned a number, which is called the Index node number (inode index) or inode. That is, the

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