Linux

View free memory/physical memory usage/remaining memory in a Linux system There are many ways to view system memory, but the main is to use the top command and free command How do you see the results when you execute the top command? Here is a

1. Preface In embedded devices, hard disk space is very limited, when it comes to the process of often write log, you need to consider the size of the log and delete, or soon the hard disk is full, causing the log program crashes. In order to

The speed or efficiency of linux® is very good, but in some cases, such speed is not enough to meet the demand. What we need is the ability to meet scheduling deadlines within a specific tolerance range. This article will reveal various options for

Because of network instability and slow file uploads, we often split files into multiple files and upload them to the server -rw-rw-r--1 weblogic weblogic 50000000 02-06 16:18 weblogic-linux.z01-rw-rw-r--1 weblogic weblogic 50000000 02-06 16:18

Because there are several common files to be modified during the u-boot transplant, it is too cumbersome to manually modify them every time. Making patches can solve this problem. The collection of learning materials is relatively simple, method a

Sed SED is a powerful text-processing tool You can use a regular match to insert the text to delete changes, and so on When SED is processed, one line is processed at a time, each time the current processing is stored in a temporary buffer, the

Rz,sz is a command-line tool for Linux/unix Zmodem file transfer with Windows. Windows side needs to support Zmodem TELNET/SSH clients (such as SECURECRT), run the command RZ is to receive files, SECURECRT will pop up the file selection dialog

Port mappings, including local port mappings and remote port mappings. This article describes two possible approaches: iptables and SSH. Here's how to use both methods. Local Host IP a:192.168.1.119 Remote host IP b:192.168.1.120 Method 1:ssh Way:

Network system is the most complex and powerful subsystem in Linux design. This article is not to state the Orthodox Linux network system, but only focus on the link layer, that is, the so-called network card driver. TCP/IP protocol family, each

Instance: compressing the contents of the current directory on the server as xxx.zip files Zip-r xxx.zip./* Unzip the zip file to the current directory Unzip Filename.zip ============================ Another: Some servers do not

Socket programming refers to a complete set of API programming about sockets, not just the use of socket () system calls, but also a complete set of functions around this system call. Here we will start from the basics and learn how to write the

1, ': Command replacement In the output of a sentence, if you want to add command output in the middle, in the inverted quotes inside the command can be done, and $command is the same. [Root@localhost ~]# Echo today ' date +%f 'Today is 2016-08-03

Install the Basic Development packroot@ubuntu:~# apt-get update && apt-get install-y build-essential Bison Flex Manpages-devroot@ubuntu:~# echo $?0 Install ARM-LINUX-GCCDecompression arm-linux-gcc-3.4.5-glibc-2.3.6.tar.bz2 from Vedon teaching CDTar

In the process of inevitable need to use command-line options, you can choose to parse the command-line options, but there are ready-made, why rebuild the wheel. The following describes the use of getopt_long_only and Getopt_long (roughly the same)

1. Linux Network Path 1.1 Sending End 1.1.1 Application Layer (1) Socket The application layer of the various network applications are basically through the Linux Socket programming interface and kernel Space network protocol stack communication.

REFEREMCE:https://www.smarthomebeginner.com/mount-virtualbox-shared-folder-on-ubuntu-linux/1) VirtualBox Manager, setting, share folder, add share folder, select "Auto-mount" "Make permanent"2) Open the VirtualBox virtual machine, the shared folder

One,/etc/passwd is the user database, where the domain gives the user name, encryption password and other information of the userThe record line in the/etc/shadow file corresponds to one by one in/etc/passwd, which is automatically generated by the

OverviewThe network is configured with Vlan,vlan to isolate the broadcast, while the DHCP protocol uses broadcast, that is, by default the DHCP protocol can only be used within the VLAN, the DHCP server in VLAN30, only the client in VLAN30 can

Installing plugins Docker plugin, first need to install the Docker plugin in your idea, navigate to file-setting-plugins and search for Docker integration installation Configure the Docker server to locate

Date: The command to display the timeCommon Command ParametersUsage: date [options] ... [+ format] or: Date [-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]] Displays the current time in the given format, or sets the system date. -D,--date=