What enterprise cloud computing technology to master? What an introduction to Linux? Linux is a free to use and free dissemination of Unix-like operating system, is based on POSIX and Unix multi-user, multi-tasking, multi-threading and multi-CPU support for the operating system. In practical applications, cloud computing and Linux multi-hook, many companies will examine their mastery of Linux in the recruitment of cloud computing talent. Then share with you gave Linux started.
1, the absolute path, the current directory, parent directory, the home directory are what represent? How to change directory what order?
Absolute path: as /etc/init.d
The current directory and the parent directory: ./ ../
Home directory: ~ /
Change directory: cd
2, the screen is cleared, the current command execution sleep, to view the current user id what order?
Clear screen: clear
Exit the current command: ctrl + c to completely exit
Execution sleep: ctrl + z suspends the current process to restore the background fg
View the current user id: "id": View shows the current login account uid and gid and Group-owned and user name
3, Ls command performs what function? Which parameters can take, what's the difference?
Ls functions performed: Lists the specified directory and file directory
Which parameters and the difference between: a all files; L details, including the size of the number of bytes, read-write and the like executable permissions
4. Create a directory what order? What command to create a file? What command to copy files?
Create a directory: mkdir
Create a file: typical, such as touch, vi files can also be created, in fact, as long as the output to a file that does not exist, will create a file
Copying files: cp
5, file permissions to modify what order? Format is kind of how?
Modify the file permissions: chmod
Format is as follows:
$ Chmod u + x file is the main file to execute permissions increase
$ Chmod 751 file permissions to assign file owner read, write, execute permissions (7), and to assign read the file's group, permission to perform (5), and to other users assigned to perform (1)
$ Chmod u = rwx, g = rx, another form of embodiment o = x file on the
Assign read permissions $ chmod = r file for all users
$ Chmod 444 file above cases
$ Chmod a-wx, a + r file supra Example
$ Chmod -R u + r directory recursively assigned to the owner of all files and subdirectories under the directory read directory permissions
6, view the file contents are what command?
vi filename # editing view, modify
# cat file name show all file contents
more filename # page display file contents
less filename # and more similar, better can flip forward
tail filename # see only the tail, you can also specify the number of rows
head filename head # view only, you can also specify the number of rows
7, Linux command, which has several wildcards that can be used?
"?" Can replace a single character
"*" To replace any number of characters
Square brackets "[charset]" Alternatively charset any single character set, such as [az], [abABC]
8, Linux in the process, which has several state?
1) not interrupt status: The process is sleeping, but at the moment the process is not interrupted. Can not be interrupted, refers to the process does not respond to asynchronous signals.
2) the pause state / status tracking: transmitting a signal SIGSTOP process, it will be due to response to the signal state into TASK_STOPPED; when the process is being tracked, it is in this particular state TASK_TRACED.
"Being tracked" refers to the process pauses, waiting for tracking its process to operate it.
3) ready state: the state of the queue run_queue
4) Run state: the state of the queue run_queue
5) can interrupt sleep: in this state because the process of an event waiting to happen and is suspended
6) zombie state (zombie): The father did not wait by the way, the series of system call the corpse of the child process (task_struct) also freed
7) exit status
Of course, in addition to the above, Linux-related knowledge, there are many, will not list them here. If you want to be a great cloud of talent, in addition to master the knowledge of Linux, but also to understand the knowledge database, Docker containers, Shell scripts operation and maintenance, Python and other languages, if you want to quickly grasp this series of technical, professional learning allows you to efficiently and quickly master the required high-paying technology companies!