Linux Commands (ii)

File

Purpose: Identify file types

Format: File file name

Everything under Linux is a file

Example:

File ~/.BASHRC as ASCII-encoded text files

File ~/.VIMRC is a UTF-8 Unicode encoded text type

File/bin/pwd appears elf 64-bit LSB executable, which is the elf executable file

file/dev/# appears character special (character device file), block Special (block device file), and so on.

Which and whersis

Purpose: Find where a command or application is located

Format: which command name/application name

Which pwd navigate to/bin/pwd

Which GCC positioning to/USR/BIN/GCC

Whereis pwd

Find the location of the executable program location/BIN/PWD and man pages

　　

The concept of compression: narrowing down the file

Compression type: Lossless compression and lossy compression.

A. lossy compression: For example, Video, MP3.

B. lossy compression: Normal file compression, in order to ensure the correct transmission of information.

Common compression Commands:

Section:

Single file with bZIP,

Files ending in. g are extracted with gzip,

Gzip Common options:

-L (list) lists compressed content

-K (keep) preserves input files when compressing or decompressing

-D (decompress) extracts the extracted files

1) View

Gzip-l Compressed file name

Gzip-l pwd.1.gz

2) Unzip

GZIP-KD pwd.1.gz

Gzip

Cond

　　

　　

　　

Linux Commands (ii)