🚀 author: “Big Data Zen”

🚀 Column introduction: This column mainly shares Linux technology, will involve common Linux command operation, common service applications and related operation and maintenance knowledge, as well as some deep analysis of Linux system 🚀 fan benefits: join the big data community of small Zen

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Everything is a file in Linux!

/ : Root directory. Generally, only directories are stored in the root directory. Do not store files, modify, or delete contents in the directory

/ MNT: test directory. Files in it are not important

/root: home directory of user root

/home: home directory of common users

/ TMP: temporary directory (e.g. when a file is uploaded)

/var: stores frequently modified data, such as program running log files

/boot: Store the kernel files used to start Linux, including connection files and image files, try not to touch things here

/etc: the default place for storing the configuration file

/bin: a program that can be executed by all users

/sbin: a program that only root can execute

/usr: this is where you can use your own software, such as mysql or other related software. /usr/local/

/dev/cdrom #dev/cdrom #dev/cdrom At this time if we see our ISO file hanging up, you can use the following command to view.

/media: Mount disks are usually empty until they are mounted (how to use this drive? Mount /dev/cdrom /media # mount /dev/cdrom /media # mount /dev/cdrom /media # mount /dev/cdrom /media

Unmount the CD-ROM: umount /dev/cdrom

Absolute path: in plain English, the complete path

Relative path: relative to the current location path./ represents the current directory meaning.. / stands for the directory above (CD..) perform

The use of Linux Master editor VI
Basic concepts of vi :(three modes)

I: imperative # This mode is not editable ii: insert mode # also known as edit mode III: bottom line mode

1: Enter insert mode: press I or O on the keyboard or A # press O to start another line
2: Enter command mode: Press esc in the upper left corner of the keyboard
3: Enter bottom line mode: The premise is to enter in command mode
1: Operations in command line mode:
$ Move to the end of the line
gg This mode will automatically jump to the beginning of the first line by pressing GG
G Move to the beginning of the last line of the document
x # delete content, delete a character
dd Delete the entire row where the cursor is located
u # undo the original operation
v Press Y to copy the range. Press V to select the range
p # paste
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2: In bottom line mode operation, enter colon to enter bottom line mode
n #n is a number. Move the cursor to line NTH # for example, enter 20 to jump to line 20.
/ # find content #/lovxyz so that the cursor jumps to the line of the word%s/word1/word2/gThe meaning of this line is to find the word1 string from the first to the last line and replace the string with word2
n1,n2s/word1/word2/g #n1 and n2 are numbers. Search for the string word1 between lines n1 and n2 and replace it with #. For example, if you type set nu to display the number of lines, n1 and n2 will be 12, and 20 will be between 12 and 20.For word2set nu # display line number
set nonu # cancel line number
q! # Force leave without saving
wq # Leave and save
wq! # Force leave and save! ls# Leave temporarily
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