is command in linux

The DD command copies a file with a block of the specified size and makes the specified conversion at the same time as the copy.How to use: DD [OPERAND]Parameter comment:  bs=BYTES        read and write BYTES  bytes at a time  (also see ibs=,obs=)   

Familiar with the Linux partners know that in the open-source Linux environment, the main idea is that everything is a file, anything in Linux can be seen as files, then we use these files when we face a problem how to find a file, Here I take

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

Used to generate all integers from one number to anotherExample one:# seq 1 10The result is 1 2 3 4 5 6 7 8 9 10Example two:#!/bin/bashFor i in ' seq 1 10 ';Doecho $i;Doneor withFor I in $ (SEQ 1 10)can alsoseq-F,--format=format use printf style

1. RoleThe grep command in a Linux system is a powerful text search tool that uses regular expressions to search for text and print matching lines. grep full name is global Regular ExprEssion Print, which represents the global regular expression

This article combs some of the common commands for Linux users and user groups. Related configuration files: /etc/group Store all user group information in the current system /etc/gshadow Store passwords for all user groups in the

When you are playing Linux, if you often use the command line to control your Linux system, then the efficient use of the command history mechanism will make the efficiency gains greatly. In fact, once you have mastered the 15 examples of Linux

We all know that there is a man command in Unix/linux, you can query common commands, functions. But for us, we only know how to use"man function number"to query people, will encounter a lot of problems, such as: Man read, I want to see the ANSI C

What does the CPU information in the top command of Linux mean?Cpu (s): 62.1% us, 15.9% sy,0.1% ni, 19.4% id,2.0% wa,0.1% hi,0.4% simem:8247956k total,8232004k used,15952k free,205240k buffersswap:8191992k total,48k used,8191944k free,7156092k

du [-ABCDHHKLMSSX] [-l ][-x ][--block-size][--exclude=][--help][--version][directory or file] Common parameters:-A or-all display disk usage for each specified file, or display their own disk usage for each file in the directory. -B or-bytes

The top command is a common performance analysis tool under Linux that shows the resource usage of individual processes in the system in real time, similar to the Task manager for Windows.Top is used to dynamically monitor the system resources of

Explain the output of the free command on Linux.Here is the result of the free run, with a total of 4 rows. For convenience, I added a column number. This can be seen as a two-dimensional array fo (free output). For example:FO[2][1] = 15402628 fo[3][

1: User command, can be initiated by anyone2: System calls, functions provided by the kernel3: Library functions4: Special files in device,/dev Directory5: File format description, e.g./etc/passwd6: Game7: Miscellaneous, such as macro command

Have you ever encountered a situation where you need to do the same for multiple files over and over again? If there is, then you will certainly have a deep feeling how boring and inefficient. Fortunately there is a simple way to use the Xargs

The top command is often used to monitor Linux system conditions, such as CPU, memory usage, the programmer basically knows this command, but it is strange to use it very few people, such as the top monitoring view of the memory value of the meaning

1. RoleThe last command in a Linux system is a display of recent user or terminal logins, and its use rights are for all users. Using the last command to view the logof the program, the administrator can tell who has or attempted to connect to the

FindFind is the most common and powerful find command, finding a file on disk, using it to find any file you're looking for, which is a bit slow.Find Path-option [-print] [-exec-ok command] {} \;Path is the file, option is the parameter, [] the

Want to make your Linux sprout?First you need to install Cowsay softwareThe command is as follows: sudo apt-get update;sudo apt-get install CowsayAnd then enter the command on it, by default, animals are cowsOther animals can be set, you can use the-

To understand the current process when using Linux, you need to look at the current process, and the PS command is the most basic and very powerful process view command. Use this command to determine which processes are running and running, whether

The until command is just the opposite of the while command, and the until command requires a test command that typically results in a non-0 exit state, as long as the exit status of the test command is not 0,bash the shell executes the command