Linux Notes---Common directives

(not regularly updated in ... ）

1. Switch between normal user and root

Su Root

2. Set a new root user password

sudo passwd root

Then enter the new root user password

3. Common compression commands

Format Introduction

*.z Compress Program Compressed files

*.gz gzip Program Compressed files ( most widely used )

*.BZ2 BZIP2 Program Compressed files

*.tar the TAR program to package data that has not been compressed

*.tar.gz tar program packaged files, which are compressed by gzip

*.TAR.BZ2 tar program packaged files, which are compressed by bzip2

Compress command

gzip [-cdtv#] File name

-C: Output compressed data to the screen, which can be processed by data flow redirection

-D: decompressed parameters

-T: can be used to verify the consistency of a compressed file to see if the file is error-free

-V: can show the source file/compressed file compression ratio and other information

-#: Compression level, 1 fastest but the worst compression ratio, 9 slowest but compression ratio best default is-6

Read GZIP-Compressed files

Zcat "File name"

bzip2 [-cdkzv#] File name

Parameters:

-C: Output the data generated during the compression process to the screen;

-D: decompressed parameters

-K: retains the source file without deleting the original file;

-Z: Compressed parameters

-V: can show the source file/compressed file compression ratio and other information

-#: Same as gzip, all in the calculation of compression ratio parameters,-9 best,-1 fastest.

Read BZIP2 Compressed files

Bzcat "File name"

4. Common Packaging commands

Tar

Compression: Tar-jcv-f [filename.tar.bz2] The name of the file or directory to be compressed

Query: tar-jtv-f [filename.tar.bz2]

Decompression: tar-jxv-f [filename.tar.bz2]-C to extract the directory

Linux Notes---Common directives