xxd command

1. RoleThe top command is used to display the program process in progress, and the permissions are all users.2. FormatTop [-] [D delay] [Q] [C] [s] [s] [i] [n]3. Main parametersD: Specifies the interval of the update, in seconds.Q: There are no delayed updates. If the user has a superuser, the top command will be executed with the highest precedence.C: Displays the full path and name of the process.S: Cumul

1, Connection MySQL format: mysql-h host address-u user name-P user Password1. Connect to MySQL on this machine. First open the DOS window, then enter the directory Mysql\bin, and then type the command Mysql-u root-p, enter after the prompt you to lose the password. Note that the user name can have a space or no space, but before the password must have no space, or let you re-enter the password.If you have just installed MySQL, superuser root is no pa

One linux Command every day (12): more command, linux Command 12 more The more command is similar to cat. The cat command displays the content of the entire file on the screen from top to bottom. More will display one page at a time to facilitate users to read one page at a

1, execute command and script on remote host based on password and secret keySsh-t IP "CLI or shell.sh";The 2,C program implements the above functions--based on password-lessPorting the simple C program above to a different system to use the testAuthorized_keys;Copy the ~/.ssh/id_rsa.pub itself to the host that needs passwordless and append the id_rsa.pub content to the ~/.ssh/authorized_keys, then you can passwordless the login.3. Copy the SSH key to

Watch is a very useful command, basically all Linux distributions with this gadget, like the name, watch can help you monitor the results of a command, save you to manually run over and over again. Under Linux, watch is the periodic execution of the next program, and full-screen display of the execution results. You can use him to monitor everything you want. The result of the

Tags: log file file distinguishes TXT access short expression pipe character class Shell Special Symbol Cut command Special symbols* wildcard characters, any of any character？ Any one character# comment Characters\ de-Semantic charactersC=\ $a \ $bEcho $c| Pipe characterCat 1.txt |lessCat 1.txt |moreCut intercept stringShow first 2 rowsCAT/ETC/PASSWD |head-2Cut ":" First paragraph cut-d ":"-F 1Cut two: cut-d ":"-FETC/PASSWD the firs

Linux Command: cp command learning and use, linux Command cp Learning The cp command is used to copy files or directories. It is one of the most common commands in Linux. In general, shell sets an alias. When copying a file under the command line, if the target file already

Linux Command learning Summary: rm command, linux Command summary rm Command introduction: This command is used to delete files or directories in Linux. Normally, rm will not delete the directory. You must specify the-r or-R parameter to delete the directory. In addition

Tags: string alt match Delete offset size file internal command string Command history HistoryEnvironment variables:Histsize: Number of records in the command historyHistfile:~/.bash_historyHistfilesize: The number of history records in a command history filehistory-d OFFSET: Delete a HistoryHistory + Num

Linux Command: rcp command usage details, linux Command rcp details Rcp stands for "remote file copy" (remote file copy ). This command is used to copy files between computers. The rcp command has two formats. The first format is used to copy files to files. The second forma

Linux Command (8): cp command, linux Command cp The cp command is used to copy files or directories. It is one of the most common commands in Linux. In general, shell sets an alias. When copying a file under the command line, if the target file already exists, it will ask wh

Shell Special character Cut command Any of any characters? Any one character#注释字符\ de-Semantic characters·| pipe characterCut intercept string-D Specify delimiter-f Specifies the Intercept paragraphBy looking at what we can see,/etc/passwd is divided into 7 segments.·If you use ":" to intercept the first paragraph of the delimiter·Intercept the first to second paragraph (comma in English)·Intercept one to three segments (with a horizontal bar)·-c

Linux basic command date command, linuxdate command 1. Time Command: date The parameter passed to the date command applies to '+' (plus sign). In the parameter passed % Y indicates year % M indicates month % D Indicates day % H indicates the hour (the time is 00-23) %

Ls- L : Long Format File type: the - : Normal file (f)D: Catalog FilesB: block device files (blocks)C: character device files (character)L: Symbolic Link file (symbolic Linkfile)P: command Pipe file (pipe)S: socket file (socket) File permissions: 9-bit, every 3-bit group, each group: rwx (Read, write, execute), r-- Number of hard links to files owner of the file Genus Group of files File size (size), in bytes timestamp (timestamp): Last Modified time

Linux Command head command, linux Command head The head and tail are just as easy to understand as their names. They are used to display a certain number of text blocks at the beginning or end, and the head is used to display the beginning of the file to the standard output, and tail takes it for granted that it is the end of the file. 1.

The KILL command is used to terminate the run of the specified process.Sends the specified signal to the corresponding process. Not specifying a model will send Sigterm (15) to terminate the specified process. If the program can not be terminated with the "-kill" parameter, it sends a signal of Sigkill (9), which will force the end of the process, using the PS command or the jobs