Linux Learning Notes (i)

1, Ubuntu version of the main version of ERA name + sub-version of this month, April for the stable version, October for the beta, singular for short-term support, even for the long-term support.

2, Shell for Command parser, (Shell--unix,bash--linux), we also call bash shell.

3. Command: date--date; history--show history command; ctrl+p--list shows history commands up; ctrl+n--lists down the history command;

The cursor moves forward--ctrl+b;ctrl+f--backward, ctrl+a--moves to the beginning of the line, ctrl+e--moves to the end of the row, ctrl+h--deletes the character before the cursor, and ctrl+d--deletes the character after the cursor;

ctrl+u--Delete all of the preceding cursors. Two consecutive tab--smart prompt commands, simple padding and then pressing the TAB key to AutoFill. ctrl+l--Clear Screen

CD Directory name--directory switch; tab once auto-complete path; tab two prompt directory all subdirectories

4, directory structure, tree structure, no drive concept; ls/--view root directory;/bin--store frequently used commands, cd/bin--into the bin directory. /boot--boot entry file,/dev--device files, all section files, one file per peripheral,/etc--operating system or application software configuration file,/home--operating system user directory, is a normal user, not the root user

/lib--linux dynamic link library used under the operating system, that is, shared library;/lost+found--is generally empty,/media and/mnt--Mount peripherals, u disk, optical drive, automatic mount/media, manual mount/mnt;

/opt--third-party software directory,/proc--virtual directory,/root--superuser directory,/sbin--system Administrator's command,/user--user software Resource directory, software installed in this directory by default, can also be installed into the/OPT directory;

5, the absolute path starts from the root directory to write,/HOME/TEST/AA; the relative path is relative to the current path, BBB, relative path,. Represents the current directory,.. Represents the current top level directory,-switch in the adjacent directory, such as cd–; [email protected]: ~ $:YYB Indicates the currently logged on user, @--in, ubuntu--hostname, ~ Represents the user's home directory (host directory), $-- The current user is a normal user, #--super user, sudo su--switch to Superuser, prompt for the password of the normal user, pwd--display the current path; exit--exit the Superuser; home directory: Cd;cd~;cd/home/jia;

Linux Learning Notes (i)