Linux basic instructions (two)

Linux basic instructions

If you want to do well, you must first sharpen your tools
ffmepeg

ls (display files in the current directory)

ls-old

• a: All files
• l: list
• t: reverse order

.

• Current directory

…

• Up-level directory

-drwxr-xr-x

• File owner
• File array
• Other users

-: ordinary file, d: directory file, l: link file, b: device file, c: character device file, p: pipe file

cd

Enter a specified directory

cd -

• Only switch between the current two directories

mkdir

Create folder/directory

• Permission related can also be viewed, such as 775

mkdir -p a/b/c

• Specify the parameter p to create multiple directories at the same time

pwd

View the specific location of the current directory

cp

Copy a file or directory from where to

cp .file/anotherFile.

• Copy the file in the current directory to another file

cat

View

cat file.txt

• View the contents of the file

rm

Parameter Description

• Directory == Folder
  rm command will not delete folders. To
  delete empty folders, you can use the rmdir command
  but rm -R can delete folders, regardless of whether there are files or subfolders under the folder.
  Just delete this directory tree. It is the sub-files and sub-folders starting from it.
• cp also has a corresponding -R option, which also copies the directory tree rooted at this.

rm xxx

rm -r xxx

• Delete circularly, but will prompt

rm -rf xxx

• Cycle deletion, f is mandatory

sudo

Switch the permissions of the current user, for example, visitors cut the administrator to install a certain software

pkg-config

C and C++ development application program, link library use

Basic use of Vim

:wq

• Save and exit

  • :q

    • drop out

  • :w

    • Save

dd

• delete

yy

• copy

p

• Paste

i

• Enter edit mode

esc

• Exit edit mode

h

• Shift left

l

• Shift right

j

• Move down

k

• Move up

Environment variable

bash_profile

zshrc

env

• View current environment variables

grep path

• Search path

Path

• working principle

  • When a command is executed, a global search will be performed, if found, it will execute otherwise an error will be thrown
  • Similar to a global environment variable area

pkg_config_path

• working principle

  • For example: using ffmpeg, you need to import a specific library
  • The linux system is used to find the library file path. If you don't configure it, you need to write the library path and header file yourself when compiling the program. Will be troublesome

• pkg-config --libs --cflags libavutil

  • libs that library
  • cflags header file

Installation tool

mac

• brew

  • brew search xxx
  • brew install xxx
  • brew remove xxx

ubuntu

• apt

centOS

• yum

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