linux basic tutorial

Uuid Identification code of the network device Onboot Whether the device is activated when the system boots DEVICE Number of the physical NIC IPAddr IP Address GATEWAY Gateway Address NETMASK Subnet mask DNS1 DNS server address PREFIX The number of bits of the subnet mask HWADDR The MAC address of the physical network card

all the files in the folder and its directory.Now, suppose you have a folder test with some scripts, all of which (including the TEST folder) have permission-rwxrwxr-x. If you want to remove the Write permission from the user group, you can run the command:Chmod-r g-w TESTRun the command ls-l, and you can see that the permission information for the TEST folder listed is drwxr-xr-x. The user group is removed from the Write permission (as is the case with all files in its directory).SummarizeYou

folder test with some scripts, all of which (including the TEST folder) have permission-rwxrwxr-x. If you want to remove the Write permission from the user group, you can run the command:Chmod-r g-w TESTRun the command ls-l, and you can see that the permission information for the TEST folder listed is drwxr-xr-x. The user group is removed from the Write permission (as is the case with all files in its directory).SummarizeYou should now have an in-depth understanding of the

Basic Linux Tutorial: Automatic Installation of Linux Kickstart Starting from system installation In systems such as RHEL, CentOS, and Fedora, the program used to install the system is named anaconda. It is a FedoraProject developed by Python and can provide graphic or text interfaces for system installation. Before in

Linux Basic tutorial Linux password-free ssh login SettingsBrother LianOverviewin some common devices ssh, SCP, do not enter the password can save a lot of time. Generate keySee if there is a local key, if there is, do not generate, otherwise it will affect the previous device.Copy the code code as follows :(brother e

Basic Linux tutorial ---- install software in LinuxIntroduction This article introduces several methods for installing software in Ubuntu and the use of apt and dpkg tools.1. Install software on Linux There are usually three methods for installing software on Linux: Online

log.log1 2012-012 2012-02345 ======[Email protected] test]#Example four: Using here doc to generate filesOutput:Copy CodeThe code is as follows:[Email protected] test]# Cat>log.txt > Hello> World> Linux> pwd=$ (PWD)> EOF[Email protected] test]# Ls-l Log.txt-rw-r--r--1 root root 3710-28 17:07 log.txt[Email protected] test]# Catlog.txtHelloWorldLinuxPwd=/opt/soft/test[Email protected] test]#DescriptionNote that the Bold section, here Doc, can be used f

, you can use the Shred command to implement,shred is a part of the coreutils , so Linux basically will have this command.　　Shred How to delete files completely :The code is as follows　　$ shred-u File　　Shred will overwrite the node and data block where the file resides with some random content, and delete the file (-u parameter ).If you want to clear a bit more thoroughly you can add the- z parameter, which means to fill with random data, and then fil

Basic tutorial for Embedded Linux (version 2nd) Edit recommendations Authoritative book on Embedded LinuxAmazon five-star ratingComprehensive Analysis of Embedded Linux development, revealing a large number of technical Insiders Basic Information Original Title: Embedded

OverviewIn some common devices ssh, SCP, do not enter the password can save a lot of time.Generate keySee if there is a local key, if there is, do not generate, otherwise it will affect the previous device.Copy the code code as follows :(brother even Linux training www.lampbrother.net)　　LS ~/.ssh/id_rsa.pubDo not use Ssh-key-gen to create public keys and keys on localhostCopy the code code as follows :　　SSH-KEYGEN-T RSAReturnCopy the public key to the

To view the operation time of the history record in the Linux operating system, you can do this in the following steps:Learn Linux　　1, modify the /etc/profile file, add at the end:exporthisttimeformat= "%f%t ' WhoAmI '"　　2, or in the user directory, modify the file . bash_profile, add export histtimeformat= "%f%t ' WhoAmI '"Exit the terminal and log back in.example, check The history operation time:Copy t

　　LinuxfindBrother even Linux training summary these timestamps includeCopy the code code as follows:Mtime file content Last modifiedThe time that the Atime file was read or accessedCTime File Status Change timeThe meaning of Mtime and atime is easy to understand, and ctime needs more explanations. Because the inode maintains the metadata on each file, the Inode data also changes if the file-related metadata changes. This can be caused by a series of

Linux Basic tutorial Linux password-free ssh login SettingsBrother LianOverviewin some common devices ssh, SCP, do not enter the password can save a lot of time. Generate keySee if there is a local key, if there is, do not generate, otherwise it will affect the previous device.Copy the code code as follows :(brother e

Mago linux basic O M + intermediate + advanced video tutorial full set of video downloads (nearly 50G), linux50g Mago linux O M beginner + intermediate + advanced video tutorial full set of video downloads (nearly 50 GB)Directory details:18_02_ssl protocol, openssl and cre

, you can use the Shred command to implement,shred is a part of the coreutils , so Linux basically will have this command.　　Shred How to delete files completely :The code is as follows　　$ shred-u File　　Shred will overwrite the node and data block where the file resides with some random content, and delete the file (-u parameter ).If you want to clear a bit more thoroughly you can add the- z parameter, which means to fill with random data, and then fil

to find files that have been modified for a certain day, for example , today is a lunar month, to find out the revised document, change 0 to 2 . As follows:　　$ find/home Mtime 2Find files that have changed within 2 days　　$ find/home mtime-2The interval is expressed as ( -2,0], apparently only -1 and 0 two numbers, respectively, representing yesterday and today.Find files that were changed 2 days ago　　$ find/home Mtime +2　　c. Find files by user or user groupThis type of option is relatively c

LinuxfindBrother even Linux Training Summarizing these timestamps includesCopy the code code as follows :　　mtime file content last modified　　The time that the atime file was read or accessed　　ctime file status change time　　The meaning of mtime and atime is easy to understand, and CTime needs more explanations. Because the inode maintains the metadata on each file, the inode data also changes if the file-related metadata changes. This can be caused by