lftp commands

If you do not use the built-in command but fork to output a sub-process and execute it in the sub-process, the path of the parent environment will not be changed. After the execution is completed, it returns to the parent shell environment, and the PWD of the environment is not changed at all, so it will fail. You can write a script to test CD. Sh. #! /Bin/bashCD/home/ Run./CD. SH and you will find that the current shell path has not changed. Similarly, if you want to change many parameters

Common Linux commands and common linux commandsDirectory: relative path and absolute path. Absolute path: the path is written in the root directory, for example,/usr/share/doc. Relative Path: the path is not written by/. For example, if/usr/share/doc is to be written under/usr/share/man, you can write it as [cd .. /man: This is the relative path. Cd: Switch directory; pwd: display the current directory; mkdir: Create a new directory; rmdir: d

Common vi/vim commands and common vivim commandsWorking Mode INSERT command A attaches text behind the cursor A adds text at the end of the line I insert before the cursor I insert text at the beginning of the line O Insert a new row under the cursor O Insert a new line to the cursorLocating command H move one character to the left/the arrow to the left J. Move down one row/down arrow K move up one row/Up Arrow L move one character to the right/the

Common CentOS commands and common centos commandsSystem Command yum command Yum makecache yum generation CacheYum list installed mysql * check whether the * package has been installedRpm-qa | grep mysql * check whether the mysql * package has been installedYum list mysql * check whether there is an installation packageYum search mysql * search package Restart Reboot-h now Shutdown Shutdown-h now -H to avoid MySql corruptionView CPU More/p

Detailed description of iostat commands and vmstat commandsDetailed description of iostat commandsIostat is used to output statistics about input and output of CPU and disk, partition, and Network File System (NFS. The iostat command is used to monitor the input/output status of system devices and generate reports to modify system configurations based on statistical reports for better performance.Command Format:Iostat [-c] [-d] [-N] [-n] [-h] [-k |-m]

Network Communication commands (relatively simple ): 1. write/usr/bin/write Write [user name] Used to send information to a user, provided that the user has logged on to the server host Otherwise, there is no way to leave a message for him. Therefore, write is a real-time communication tool. End the communication with Ctrl + D E.g. write guest 2. wall [write all]/usr/bin/wall Used to broadcast information to all users Wall [message] [file name] 3. pin

Compression and decompression commands: . Gz 1. gzip [GNUzip]:/bin/gzip Gzip option [file] // compressed file,The extension name after compression is .gz.Is the most common and traditional tool in Linux. // Common software source code package formats Features: 1) only files can be compressed and directories cannot be compressed. 2) do not retain the original file E.g. gzipnewfile 2. gunzip [GNUzip]:/bin/gunzip Or gzip-d Decompress .gz . Tar 3. tar:/bi

The difference between the execution and operation of the test command is that the and command changes the destination operand while the test command does not change the destination operand,Only the status of the Flag register is affected, indicating the test result. The test and CMP commands are familiar. The difference is that the test command usually tests a single bit, while the CMP command tests the entire byte, word, or double word. If the bi

Linux text processing commands SortCommand The sort command sorts all rows in the file. The sort command has many very useful options, which were initially used to sort the file content in the database format. In fact, the sort command can be considered as a very powerful data management tool to manage files with similar content to database records. The sort command sorts the content in the file line by line. If the first character of the two lines is

Linux system management commands WallCommand The function of this command is to send information to all logged-on users. You can first write the information to be sent to a file, and then enter: # Wall In this way, information can be sent to all users. In the preceding example, the symbol " # Wall' thank you! ' Broadcast message from root (tty1) Fri Nov 26 14:15:07 1999... Thank you! # After executing the preceding command, the user's screen display

In the process of using Linux, we need to follow some parameters after each command. However, it is troublesome to manually add common parameters each time. Linux may use the command alias function to reduce your input. The following operations will be clear. OS: RedHat as4.2 Ls-l list detailed document directory informationLs-Hl lists document sizes, in K.Ls-hlt lists documents sorted by Time For the above three displays, we only need to configure alias LL = 'LS-LHT 'so that we can enter ll.

3. File backup and compression commands:(1) bzip2 command: Used to compress files. bzip2 file name, suffix bz2. Unzip to: BUNZIP2 file name. bz2(2) Gzip command: Use gzip to compress files. gzip file name, and the suffix is gz. Unzip to: Gunzip file name. gz(3) Tar command: Package A large number of files and directories into a single file. TAR-CVF Filename.tar Directory/file Filaname.tar represents the file to be created, and the directory/file repre

1. Commands for managing files and directories:(1) Pwd:print working directory (print working directory), when entering PWD, requires the Linux system to display the current location.(2) CD command: The CD command is used to change the directory in which it is located. Always return to the current home directory. If you need to convert to a different directory, you need a path name. [The difference between an absolute path and a relative path: if the

Go to Ubuntu and run the root permission command-sudo and Su commands for Ubuntu user management Sudo refers to super-user do, which allows the current user to temporarily run this command as the administrator. Su is used to change the current user. Su root is used to switch the current user to the root user. After Su root is used, all the following commands can be skipped, because the current user is alrea

Tags: Specify make unzip should parameter nbsp Create automatic and[BZIP2]Bzip2 Compress the file into bz2 format and delete the original file.Suitable for large file compression-D Extract-Specifies the compression ratio. -KKeep the original fileRelated Commands bunzip2[BUNZIP2]BUNZIP2 Decompression *.bz2Related Commands bzip2[Bzcat]Bzcat View bz2 's File contentsRelated

#. (2) query host namethe command to query the host name is hostname650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M00/9D/13/wKioL1l5qU7DSp-1AAAKx7IPdaU742.png "title=" Image006.png "style=" Float:none; "alt=" Wkiol1l5qu7dsp-1aaakx7ipdau742.png "/>It can be found that the host name displayed at the prompt is not the full hostname, but only the first part of the display, in order to facilitate the distinction.(3) directory Display~ indicates the current directory. If not entered, the d

Linux commands-system management commands I. Installation and logon commands Login1. RoleLogin is used to log on to the system and has the permission to all users.2. Format Login [name] [-p] [-h host name]3. Main Parameters -P: notifies login to retain the current environment parameters. -H: used to transmit user names between remote logins.If you choose to log

Yesterday, a person on the Bug-bash asked: why [--help did not output help information. Someone answered him because coreutils provided the [command to accept the--HELP option, and Bash's own [command does not accept any options.] When you execute [--help ] in Bash, of course the first priority is the internal command [, not the external command [, the execution of /usr/bin/[--help(on my Mac is/bin/[) to get the help information he wants.In fact, there are other external

Linux yum commands and yum commands Yum (all called Yellow dog Updater, Modified) is a Shell front-end Package Manager in Fedora, RedHat, and SUSE. Based on RPM package management, You can automatically download and install the RPM package from the specified server, automatically handle dependencies, and install all dependent software packages at a time, you do not need to download and install it repeatedly

Git Common commands and git Common commands===== Git Common commands ======= 1.Git documentation ===Git Chinese Document viewing address: http://git.oschina.net/progit/=== 2.Git basic commands ===Git config -- global user. name // set the global user name without adding gloabl as a localGit config -- global user. email