Linux

1. Prohibit root users from accessing through SSH remotely.Modify the/etc/ssh/sshd_config file. Find the following sentence:# PermitrootloginYesAs follows;PermitrootloginNoNote: remove the # above.Restart sshd server[Root @ linuxsir001 root] #

SecurecrtUse zmodemAnd LinuxServer File exchange Note: Linux in the default installation is no Sz and RZ commands, RMP package is: lrzsz-xx.xx-xxx.rpm, with RMP-Q lrzsz check whether installation, if not installed: Command: Rpm-IVH

On the Linux platform, chrome often prompts "The following plugin has crashed: Shockwave Flash" because Chrome has the Shockwave Flash plug-in, on the Linux platform, if fedora is the default Firefox browser, we may install flash-plugin on our own.

Use sEcurefxAndLinuxSecure File exchange SFTP does not need to be configured. You only need to install OpenSSL. You have created a user in Linux and can use securefx to log on remotely. FTP can be used only after installation and configuration.

A few days ago, when I saw the driver, I encountered a waiting queue. I went online to search for the queue and checked it with the code. in kernel, wait_queue is widely used. wait_queue is used for implement in device driver and semaphore.

1./linux-2.6.30.4/ARCH/ARM/include/ASM/ 1.1. ---> Use of _ raw _ write () and _ raw _ read () 1.2, ---->/* copy_to_user, copy_from_user */ 1.3. : System header file, which defines Embedded Assembly macros for setting or modifying

Statement for viewing file permissions: Enter at the terminal: Ls-l XXX. XXX (XXX. XXX is the file name) Or LL Then similar information will appear, mainly including: -RW-r -- divide the 10 digits D/null Rwx Rwx Rwx A total

InRedhat Enterprise Linux 5InstallJDK Recently, it was found that none of the JDK installation methods for Linux is feasible. There are more or less problems. Therefore, we made some effort to provide a feasible Installation Method Using Redhat as 5

The ifconfig command can be used to view information about active Linux NICs and IP addresses, subnet masks, and MAC addresses. [Root @ localhost ~] # Ifconfig Eth0 link encap: Ethernet hwaddr 08: 00: 27: D4: 71: 2D Inet ADDR: 192.168.1.104

1. Summary of scheduled tasks; A scheduled task is a task that executes the scheduled job at the agreed time. In Linux, we often use the crond server to do this. The cron server can perform specific tasks according to the time specified in the

Clear free cache by modifying drop_caches of Proc System$ Echo 3>/proc/sys/Vm/drop_caches Drop_caches detailed documentation is as follows:Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that

In Linux 2.6, there are four Io scheduling algorithms. The following is a summary:1) NoopThe Noop algorithm is completely written as no operation. This algorithm implements the simplest FIFO queue. All IO requests are operated in the

Almost every engineer who has access to Unix-like operating systems knows how to view system loads. However, the working mechanism of this item may not be clear enough. I compared some related information, added my own understanding, and made some

Three methods: 1. Use the TOP command. The usage is top-H. With this option, each row of top is not a display of a process, but a thread. 2. Use the ps command. The specific usage is PS-XH. This allows you to view all existing threads or use grep

Function Description: Find the matching strings in the file. Syntax:Grep[-Abcefghhillnqrsvvwxy] [-A ] [-B ] [-C ] [-D ] [-E ] [-F ] [-- help] [template style] [file or directory...] Note:GrepCommand is used to find a file whose content contains the

FIO is a good tool for iops testing. It is used for stress testing and verification of hardware. It supports 13 different I/O engines, including sync, MMAP, libaio, posixaio, SG V3, splice, null, network, syslet, guasi, and solarisaio.FIO official

0. Download securecrt for Linux from the official website and install Http://www.vandyke.com/download/index.html1. Run securecrt and enter licenseSecurecrt6.7. * license registration code serial numberName: Sherrill Ray   Company:   Serial Number:03-

Linux displays that all directories are under one directory tree, regardless of which drive/hardware they are located.The disk content in Linux appears as a subdirectory. The content of removable media will not automatically appear in these

1). Tar Decompress: Tar xvf filename.tar Decompress: Tar xjvf filename.tar.bz2 Decompress: Tar xzvf filename.tar.gz Package: Tar CVF filename.tar dirname1 dirname2 Package: Tar czvf filename.tar.gz dirname1 dirname2 2). GZ and. Z Decompress: gunzip

In linux user space, we often call the system call. Next we track the read system call. the Linux kernel version used is linux2.6.37. The implementation varies slightly in different Linux versions. In some applications, we can see some of the