Linux

-rwxr-xr-x 1 root root 1904 Apr startup.shThe first character,-Represents file D for folder L for: Soft connection file (similar to a shortcut under Windows)From the second character, each character represents a permission,In turn (read r=4) (write

In the actual product service publishing environment, Linux servers generally prohibit the use of remote root account login, only allow the least privileged remote account using SSH login, and then switch accounts to achieve the purpose of

Previous section content:1. System and Directory Management2. PWD command3. ... and.. Directory4. Relative path and absolute pathJob: Enter the OPT path, using the relative path method and the absolute path method to enter into the actually any

In front of a vectorcoredump example, contact with the vector iterator, can know that the vector iterator only one member _m_current point to a vector element.First look at the example:1 #include 2 3 void init (std::vector& vec) 4 { 5 for (

I. Types of files in LinuxIn a Linux system, it can be said that everything (including directories, ordinary files, device files, etc.) are files. The file type contains common files, directories, character device files, device files, symbolic link

Linux terminal usage tipsToday, I found that the Linux terminal has so many handy shortcuts.Shift+ctrl+t: New tab pageSHIFT+CTRL+W: Close tabCtrl+pageup: Previous tabCtrl+pagedown: Next tabShift+ctrl+pageup: Tab Shift leftShift+ctrl+pagedown: Tabs

Log on to your server with the root user to execute the following command, using it you can check whether your server is in a DDoS attack or not:NETSTAT-ANP |grep ' tcp\|udp ' | awk ' {print $} ' | Cut-d:-f1 | Sort | uniq-c | Sort–nThis command

FTP Local Server SetupYum Installation VSFTPD Service:[Email protected] ~]# yum-y install VSFTPDTo create a local two user:[Email protected] ~]# Useradd test1[Email protected] ~]# Useradd test2[Email protected] ~]# echo "123" | passwd--stdin test1 &>

SH file run:1. Modify to execute permissions:chmod u+x hello.sh2. Operation./hello.sh3, do not use executable permissions to modify, with SH direct operationSh./hello.shDesktop Environment Double-click Run sh file:Mac:1, modify the suffix sh to

Linux detects bad and bad blocks on the hard driveLet's start with the definition of bad and bad blocks, which are parts of a disk or flash memory that can no longer be read and written, typically due to specific physical damage on the disk surface

May be due to the problem of the power source of the computer yesterday, and then turn on, directly appear the following interface: I think, will not, the computer how the problem again (last week, the hands of the cheap, the installation of the

Semaphores are an inter-process communication mechanism used to solve inter-process synchronization and mutex problems, including a variable called semaphore and a waiting queue for the resource waiting on the semaphore, and two atomic operations on

Linux Kexec IntroductionThe function of Kexec is to run a new kernel with a running kernel, just like running an application. This mechanism enables a fast restart of the system because it skips the bootloader. In addition Kdump is based on the

Access to the character device is done through the device name in the file system. Those device names are simply nodes that are called file system trees, and they are typically located in the/dev folder.Device files for character device drivers can

In addition to having system-default monitoring items, SNMP provides a powerful feature to customize monitoring items.The EXEC option in the snmpd.conf configuration file (in the higher version of SNMP, extend instead of exec) provides a custom

Experimental project:Linux system files deleted by mistake recovery method;Host windows with Linux file sharingLab Environment:One: VMware virtual machine, Linux system RedHat6.5 (what version is not important);Two: Install the following 3 dependent

Suse dual Nic binding, suse dual Nic Here we use two NICs, eth1 and eth2. Edit the/etc/sysconfig/network/ifcfg-bond0 file (this file does not need to be created) Device = 'bond0'BOOTPROTO = 'static'BROADCAST = '10. 10.2.255'IPADDR = '10. 10.

Ubuntu speed limit and Linux traffic monitoring tool iftop usage introduction, traffic monitoring iftop Install wondershaper first: # Apt-get install wondershaper Maximum and uplink bandwidth (unit: Kb ): # Wondershaper eth0 2000 240 (download

Explanation of CentOS7 firewall commands The firewall in CentOS 7 is a very powerful function, but it has been upgraded in the firewall in CentOS 7. Let's take a look at the usage of the firewall in CentOS 7 in detail. FirewallD provides dynamic

SAMBA service construction and samba Construction1. Introduction 1. Understanding Samba is a set of applications that use the SMB (Server Message Block) protocol. By supporting this protocol, Samba allows communication between Linux servers and