linux training for beginners

DubuntuDubuntu is an enhanced version created on the basis of Ubuntu Gnu/linux,It mainly provides the good support of culture and software development tools by default.Most of its packages come from Ubuntu's official software warehouse, which is fully availableUbuntu's software warehouse installs new software for Dubuntu and updates the system.The system has a complete configuration of a functional, more suitable for

the most original home directory content in here can be seen as a new home directory templateCreate_mail_spool=yes???/etc/skelThe directory where new user profiles are stored, and when we add new users, all files in this directory are automatically copied to the newly added user's home directory.???/etc/login.defsStore some encrypted information, etc.Where for examplePass_max_days the validity period of the password (if the new user is changed after the change, the validity period is calculated

.0x03: Double-click the name to rename the target domain to baidu.com0x04: Close the above window, as shown, change the domain name successfully!0x05: Right click on the domain name to see the conversion actions that can be applied:0x06: Click All conversions, show 70x07: Click the first option.0x08: After the DNS from domain conversion, the collected DNS information about Baidu is as follows:0x09: If you want to change the test object to another field, you should save the current work map. How

#!/bin/bash#author:tianzhaogao (e-mail:[emailprotected]) #ip .txt IP file to match # okip.txt matches the legitimate iprm-rf/root/test/okip.txt #初始化touch /root/test/ okip.txt #初始化ip =$ (catip.txt|grep "^[0-9]\{1,3\}\.[ 0-9]\{0,3\}\. [0-9]\{0,3\}\. [0-9]\{0,3\}] foriin $ip do n1=$ (echo "$i" |cut-d "." -f1) n2=$ (echo "$i" |cut-d "." NBSP;-FNBSP;2) n3=$ (echo "$i" |cut-d "." -f3) n4=$ (echo "$i" |cut-d "." NBSP;-FNBSP;4) if[ "$n 1" -lt255-a "$n 2" -lt255-a "$n 3" -lt255-a "$n 4" - lt255];then

#!/bin/bash# automatic with ip#author:tianzhaogao (e-mail:[emailprotected]) line_ num=$ (cat/etc/sysconfig/network-scripts/ifcfg-eth0|wc-l) while[ "$line _num" -gt7]dosed-i ' 8c\ ' /etc/sysconfig/network-scripts/ifcfg-eth0line_num=$ (cat/etc/sysconfig/network-scripts/ifcfg-eth0|wc-l) Doneread-t30-p "PLEASENBSP;INPUTNBSP;IP:" ipnumn1=$ (echo "$ipnum" |cut-d "." -f1) n2=$ (echo "$ipnum" |cut-d "." NBSP;-FNBSP;2) n3=$ (echo "$ipnum" |cut-d "." -f3) n4=$ (echo "$ipnum" |cut-d "." -f4) if[ "$n 1" -l

/[Email protected] named]# vim Named.localhost$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com. Don't forget the decimal pointDNS in A 192.168.10.10www in A 192.168.10.10FTP in A 192.168.10.10Save exit8. Configuring Reverse Files[Email protected] named]# vim Named.loopback$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com.Ten in PTR dns.test.com.Ten in PTR www.test.com.Ten in PTR ftp

/[Email protected] named]# vim Named.localhost$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com. Don't forget the decimal pointDNS in A 192.168.10.10www in A 192.168.10.10FTP in A 192.168.10.10Save exit8. Configuring Reverse Files[Email protected] named]# vim Named.loopback$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com.Ten in PTR dns.test.com.Ten in PTR www.test.com.Ten in PTR ftp

Local Yum Source Configuration1. View Disc mount status[Email protected] ~]# mkdir/test[Email protected] ~]# mount/dev/cdrom/test/Mount:blockdevice/dev/sr0 is write-protected, mounting read-only[[email protected] ~]# DFFilesystem 1k-blocks used Available use% mounted on/dev/sda3 19407136 3331396 15089884 19%/Tmpfs 514352 514280 1%/DEV/SHM/DEV/SDA1 198337 28139 159958 15%/boot/dev/sr0 3757116 3757116 0 100%/test[Email protected] ~]#2. Modify Yum configuration file[Email protected] ~]# cd/etc/

sufficient can also be related to learning, early can be used with Youdao notes and other desktop translation software to assist, recommend the use of many neighboring countries to learn. (Baidu search into the official website, most of the online evaluation of the software is the world's best language learning software, including but not limited to a language in English.), insist on reading 1-2 hours a day to learn about the content of books, books are the author of the experience of technolog

,shadow_90,type_zmfuz3pozw5nagvpdgk=) Comparison found: Mtime and CTime changes 4. The file content has changed, use the command cat file again, and then see if there are any changes! [] (http://i2.51cto.com/images/blog/201805/24/c5a2657a9d32ebc2eabd83a37809f35a.png?x-oss-process=image/ watermark,size_16,text_qduxq1rp5y2a5a6i,color_ffffff,t_100,g_se,x_10,y_10,shadow_90,type_zmfuz3pozw5nagvpdgk=) After comparison, it was found that Atime changed 5. View time changes after changing permissions

precision.4. Startup script location for all services/ETC/INIT.D5, Uname-r U is worth the Unixname kernel version. This command can be used to view the actual kernel version.6, CD switch directory. Changedirectory's abbreviation.7. The directory where PWD prints. Printworking Directory pwd-p Print non-linked addresses.8, mkdir-m This m refers to the umask user rights. You can use MKDIR-M 711 filename to force permissions on a file.9. Mkdir-p create a directory recursively.10. Cp-p is copied wit

system access file, such as POP3, SSH, Telnet, FTP, etc. will be recorded in this file/var/log/wtmp records the information of the logged-in person, last/var/log/messages a few of the system's wrong messages/var/log/boot.log when a startup or some service is started, the activation or the message that is displayedUser records for/var/log/maillog (SendMail and POP3) in your Inbox/var/log/cron crontab The content of this routine service/VAR/LOG/HTTPD,/var/log/news,/var/log/mysqld.log,/var/log/sam

normal copy operation is performed 4.mv: Cut files or rename files. Format: MV [options] source file [target path | target file name]5.rm: Delete files or directories. Format: RM [options] File-F indicates a forced deletion, that is, a message that does not appear to be deleted. The-r parameter is also required if the directory is forcibly deleted.6.DD: Copies a file or conversion file according to a specified size and number of data blocks. Format: DD [parameter]7.File: View the type of f

Tags: conference experience blog Team start fast and Inux authIn the boom of Linux, many people have sprouted the idea of learning Linux. Compared to self-study, training is a fast, systematic knowledge of the way, but also by a lot of people's favor.Many people want to know how long it takes to learn Linux through

/[Email protected] named]# vim Named.localhost$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com. Don't forget the decimal pointDNS in A 192.168.10.10www in A 192.168.10.10FTP in A 192.168.10.10Save exit8. Configuring Reverse Files[Email protected] named]# vim Named.loopback$TTL 1D@ in SOA dns.test.com. Root. (0; Serial1D; Refresh1H; Retry1W; Expire3H); MinimumIn NS dns.test.com.Ten in PTR dns.test.com.Ten in PTR www.test.com.Ten in PTR ftp

Ports and processesThe port does not exist independently, it is dependent on the process. When a process is turned on, its corresponding port is turned on and the process shuts down, and the port is closed.The next time a process is turned on again, the corresponding port is turned on again.Common Port View CommandsPs-auxNetstat–apnThe add parameter '-n ' will convert the application to port display, that is, the address of the number format, such as: nfs->2049, ftp->21, so you can open two term

Performance Test Training: 18 commands and tools to help you locate Linux performance issuesPoptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Poptest's LoadRunner

UBUNTU one-sentence skills-getting started with Linux (for beginners) view the installation content of software xxx dpkg-L xxx find the software apt-cache search Regular Expression find which package dpkg-S filename apt-file search filename query software xxx depends on which packages apt-cache depends xxx queries which packages of the software xxx depend on apt-cache rdepends xxx to add a CD source sudo ap

Correct some misunderstandings of ctime for Linux beginners in order to distinguish ctime from mtime when they first come into contact with ctime. The mistake is that ctime only changes when the file or directory permissions change, A big mistake! After my own experiments, I have made a lot of google documents, which are summarized as follows: 1) when the file is read-only, it affects atime 2) when the file

Simple tips and commands for linux beginners (3) ctrl + c terminate the current process (entering the writing command status) ctrl + k Delete the content from the cursor to the beginning of the line ctrl + u Delete the content from the cursor to the End of the line Home key move the cursor to the End of the line file View file type more View File Content press enter to gradually scroll down Press space to s