6 Excellent mail transfer agents under Linux

The best Linux Mail Transfer agent (MTAs)What is the message transfer agent (MTA)?An MTA is an application that routes and transmits e-mail from one node to another, using a protocol called SMTP (Simple Mail Transfer Protocol) to perform its

Linux Beginner's Guide

1. Why should we study Linux?Why do we have to learn Linux? What value does Linux bring to us?Linux gives me the feeling is stable , free , good performance .stable , where is the embodiment? We use the PC, installed operating system is generally

Linux Process Creation II (EXECVE)

Three: Execve system call int execve (constchar char *const argv[],char *Const envp[]); Fork creates a new process that produces a new pidexecve that completely replaces the image of the calling process with the executed program. EXECVE starts a new

Using Cat and EOF to replace and append files in Linux

This address http://comexchan.cnblogs.com/, author Comex Chan, respecting intellectual property rights, reproduced please specify the source, thank you! =======================================================Overwrite a file content directly or

Linux----diff command

Transferred from: http://www.cnblogs.com/peida/archive/2012/12/12/2814048.htmlThe diff command is a very important tool on Linux to compare the contents of a file, especially to compare two different versions of files to find the changes. Diff

Ubuntu Linux View, edit, compare binary files

There are several ways to view the binary:Method One: HexdumpApt-get Install Libdata-hexdumper-perlAfter installation, you can hexdump the your_binary_file directly.You can also use the HD command directly instead of Hexdump.If you want to look

Kali basic knowledge of Linux Infiltration (iii): Exploit

The exploit phase utilizes the information obtained and the various attack methods to implement infiltration. An encrypted communication vulnerability diagnosis for a Network application vulnerability diagnostic project must be performed. As the

Linux General permissions and special permissions explained

1. File permissionsFile permissions are primarily defined for three types of objects:Owner: Master, uGroup: Genus, GOther: Others, OEach of these files defines three permissions for each class:Readable:rWritable:wExcutable:xThree file permissions:R:

Debug method for segment error (segmentation fault) under Linux

When we write programs in C/s + + language, most of the memory management work needs us to do. In fact, memory management is a relatively tedious task, no matter how smart you are, the experience is rich, will inevitably make small mistakes here,

Soft links and hard connections for Linux key concepts

when we log in to the Linux System, we use the ls–l command to list the files in the directory. Some of the file's display formats are as follows:lrwxrwxrwx. 1 root root 7 Jul 09:18 RC -- RC.D/RCThis is what the ghost, first contact, there will be a

Kali basic knowledge of Linux infiltration (a): Information collection

Write in front of the nonsense: recently to give some new training, sorting things, not what too high-end content, just a simple collation, I think for small white words also is dry. In the dark cloud water for a few years, not what big God level,

Linux grep command, regular expression

grep command and regular expressiongrep commandgrep, Egrep, FgrepGrep,sed,awk Text Processing Three MusketeersGrep:global search REgular expression and Print out of the line; finds the regular expression and displays the matching rows;Regular

Linux I/O optimized disk read/write parameter settings

Reprint: http://wlservers.blog.163.com/blog/static/120622304201241715945256/For information about page caching, you can use theCat/proc/meminfoSee. The cached refers to the memory size (Diskcache-swapcache) used for Pagecache. With the write cache

One Linux command per day (--SCP) command

The SCP is a shorthand for secure copy, a command for remotely copying files under Linux, and a similar command with CP, but the CP is only copied natively, not across the server, and the SCP transfer is encrypted. may have a slight effect on the

Linux System Architecture Detailed

Linux systems generally have 4 main parts:cores, shells, file systems, and Applications . The kernel, shell, and file systems together form a basic operating system structure that allows users to run programs, manage files, and use the system. Part

Summary of usage of Linux Rename command file renaming

The rename command in the Linux command is mainly used to rename the file, similar to the MV command, but rename can rename the batch file, while the MV command can only rename a single file, the following gives you a detailed description of the use

Linux gets file time information to determine if a file exists

Get file time stamp (1) View all information: Stat e4.txt Example: [[email protected] ~]# stat e4.txt File: "E4.txt" size:0 blocks:0 IO block:4096 General empty file device:806h/2054d inode:486265 links:1access: (0644/-rw-r--r--) Uid: (0/root) Gid:

Linux Command Rollup 1

Allow non-root users to use "sudo"Root login system, execute "visudo", add a new rule according to the example (remember the password entered is the current user password, not the root password)#不需要密码执行sudo命令Hadoop all= (All) Nopasswd:allDateTime

linux-Count Sort Enterprise Application-uniq-sort

1. uniq-report or ignore duplicate rowsby default, only the same rows are adjacent to only one parameter the most commonly used general and sort commands are used to count the number of repeating rows. NAME Uniq-report or omit repeated linessynopsis

How Linux can decompress. zip and. rar files under Windows

Linux comes with the unzip command to decompress compressed files in ZIP format under Windows.How unzip is not installed, can be installed under Yum: yum-y Install unzipUnzip commandSyntax:unzip [options] Compress file name. zipThe meanings of each

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