Linux

Summary of several methods of Linux setup for bootLike Windows, Linux can also set some services to boot, which avoids the hassle of opening a service every time you boot up! Linux boot the service is set to boot from a few ways:Ntsysv Graphical

1. Modify the host name:# hostname Bigdata-cdh01.ibeifeng.com# vi/etc/sysconfig/network2. Turn off the mail feature of the Linux system automatically prompt:echo "unset mailcheck" >>/etc/profile3.ssh Password-Free login user home directory:CD.

How Linux looks at how a port is consumed by which process:1. Lsof-i: Port number2. Netstat-tunlp|grep Port numbercan see which process is consuming the specified port"Step One" lsof-iThe lsof-i is used to display conditions that match the condition,

1. Physical protectionBIOS setup PasswordBoot grub.conf Add password2. System installation is minimized and only base services are installed3. Application data partitioning and system isolation4. Disable boot-up services that do not need to start5.

The Three Musketeers of LinuxAwk (the boss of the Three Musketeers) awk/oldboy/test.txtFilter file command to filter the content file nameSed (the third swordsman's Dick) Sed-n/oldboy/p test.txtFilter file-n Cancel default output (parameter) filter

TR Command Introduction and useDirectory:Introduction to the 1.tr command2.tr command formatThe 3TR command uses the item.4. Use of the Common TR commandTR Command Introduction　　Translate, compress and/or delete characters from standard input, write

What isEpollWhat is Epoll? According to the man manual, it is an improved poll for handling large batches of handles . Of course, this is not the 2.6 kernel, it is introduced in the 2.5.44 kernel (Epoll (4) is a new API introduced in Linux kernel 2.5

Common parameters: -A: Copy the attributes of the file together -P: Copied along with the properties of the file, not by default, similar to-a, often used for backup -I: If the target file already exists, the action will be asked before

Command>filename redirect the standard output to a new fileCommand>>filename redirecting standard output to a file ( append )Command 1>filename redirect the standard output to a new fileCommand>filename 2>&1 redirect standard output and standard

Ask:linux through the source code to compile the installation program (Configure/make/make install role) ConfigureThe Linux platform has various configurations, which need to be determined by configure, such as: CC or GCC, directory of

[email protected] ~]$ LLTotal 32-rw-r--r--1 Oracle oinstall 24576 Mar 15:26 countries.dmpDrwxr-xr-x 2 Oracle Oinstall 4096 Mar 12:39 scriptDrwxr-xr-x 2 Oracle oinstall 4096 Mar 14:51 TempHere is the import:[Email protected] ~]$ ImpImport:release 10.2

First, the concept of continuous integration1.1: A general overviewContinuous integration continuous integration continuous delivery continuous Delivery continuous deployment continuous Deployment1.2: What is continuous integration:Continuous

BZ creates a block cloud drive to add to the virtual machine, and then mounts the hard drive as usual on the USB drive:Mount-t ext4/dev/vdb/mnt/xxxxThe results reported the following error:Mount:wrong fs type, bad option, bad Superblock

HTTP://WWW.LINUXDE.NET/2013/12/15452.HTML1, modify user process can open file limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened

1. View Linux Versioncat/etc/redhat-6.9 (Final) ———— > view version number uname-m#x86_64 ———— > View System 64-bit /32-bit uname-R #2.6. -696. el6.x86_64 —————— > Kernel version2. Close SELinux and Iptables'

In the crontab file created by the user, each line represents a task, each field of each row represents a setting, its format is divided into six fields, the first five is the time setting segment, and the sixth paragraph is the command segment to

Problem[Email protected]_exercise mnt]# SCP [email protected]:/etc/profile.d/motd1.sh/etc/profile.d/@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ warning:remote HOST Identification has changed! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Common commands:1. View catalog: LSLS-A contains hidden directoriesLs-l Show details,-start with file D as directoryBlue for CatalogGreen as an executable fileBlack (white): Normal file2. See Help:Man command nameQ exit3. Look at the current

Gdb debugging: gdbarm in linux pc and linux armLinuxPCApplication gdb debugging: 1. View core File ParametersYinkui @ yinkui-desktop :~ /File_unzip/cp_module $Ulimit- Core file size(Blocks,-c) 0 // generate the number of core files without

Glibc-commons dependency parsing version error, xxx is duplicate yyy, Glibc-commons has two versions installed. As a result, many software packages dependent on glibc-commons have been installed with two versions; The solution is to clear the