java displays text file content displays file display content

Common Linux commands--file related operations

1, user switching

su(switchuser)

2, display the file list of the current directory

ls(list)

ls-l

ls-a(all)

ll

ll-a

On Linux, hidden files begin with "."

3, directory operations

Switch directory: cd(changedirectory)

Display the current directory: pwd(printworkingdirectory)

Create directory: mkdir(makedirectoriy)

-pIf the parent directory does not exist, first generate the parent directory (parents)

cp copy file or directory (copy)

-r recursive processing, copy the files and subdirectories in the specified directory together (recursive)

mv Unicom file or directory, file or directory rename (move)

rmdir delete empty directory (removedirectoriy)

rm delete file(remove)

-rDelete all files in the directory at the same time (recursive)

-f force delete file or directory (force)

Ordinary users will not receive any prompt when deleting

However, when the super administrator deletes, he will be prompted

Additional point: cd~can quickly reach the home directory

4, Editing of file content-VI, VIM (emphasis)

work flow chart:

Insert command parsing:

a: Add text after the current character;

A: Add text at the end of the line;

i: Insert text before the current character;

I: Insert text at the beginning of the line;

o: Insert a blank line before the current line;

O: Insert a blank line after the current line;

Shortcut commands:

Location command

: setnumber displays line number

: setnonumber cancels the line number

:n to the nth line of text

gg to the first line of text

GTo the last line of text

Delete command

x: Delete the single character where the cursor is located

dd:delete the line

Undo command

uundo,cancel the previous operation

Ctrl rredo, return to before undo

Copy command

yy p

5, Viewing and Statistics of File Content

touch creates an empty file

Display file content:

cat displays text file content

moreDisplay text file content in pagination

less

head and tail View the content at the beginning or end of the text

head-n3java.txtView the first 3 lines of the java.txt file

wc counts the number of lines, words, and characters of text (wordcount)

-m counts the number of text characters

-w counts the number of text phrases and recognizes spaces

-lCount text lines

6, File merging and redirection

The contents of the merged files are output together, cat1.txt2.txt

Merge files: cat1.txt2.txt>3.txt

As a standard input,

cat>1.txt

cat>>1.txt

>This is a symbol for redirecting output

Case: Quickly clear the contents of a file

Use redirection method

>1.txt

7, File search

findFind the specified file in the file system

find/usr/local/-nameword.txt

8, Compression, decompression and packaging of files

Command Overview

gzip: compressed (decompressed) file, the suffix of the compressed file is gz

Bzip2: Compressed (decompressed) filelinux decompresses the zip file, the suffix of the compressed file is bz2

Tar: Packaged file or directory

Command Interpretation

Interpretation of gzip command: gzip[option] file name to be compressed (decompressed)

-dDecompress the compressed file

-lFor compressed files, display the size of the compressed file, the file size before compression, compression ratio, etc.

-num uses the specified number num to adjust the compression rate linux decompress zip file linux system introduction linux operating system tutorial, -1 or --fast indicates the fastest compression method (but the compression ratio is low),

-9 or --best indicates the slowest compression method (high compression ratio). The system default value is 6

bzip2 command interpretation: bzip2[option] file name

-dDecompression

-zCompression

-num Same as above

Interpretation of Tar command: tar[option] package file name to be packaged file 1 to be packaged file 2

-c build a package file create

-xUnpack a package fileextract

-zCompress files with gzip

-jUse bzip2 to compress files

-v Compression process display file

-f uses the file name, and the file name must be followed immediately after f

Case:

Implementing the packaging and unpacking of files

Realize compression and decompression of files

gzip1.txt compressed file

gzip-d1.txt.zip decompressed file

tar-cf33.tar1.txt2.txt//Packaging file

tar-xf33.tar//Unpack file

gzip33.tar//Compressed package file tar.gz

tar-zcf33.tar.gz1.txt2.txt//Package and compress 1.txt and 2.txt into 33.tar.gz

tar-zxf33.tar.gz//Decompress 33.tar.gz

9, pipeline command

Command format:

command1|command2

Example:

ls-l/usr/bin|less

ls-l/usr/bin|grepless

The standard output of one command can be piped to the standard input of another command:

grep is a very powerful program, used to find matching text in files

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