Compression and decompression commands under Linux--zip/unzip

Zip is a widely used compression program, the file will be compressed after the additional ". zip" the compressed file for the extension.

Parameters

-A adjusts the executable auto-unzip file.

-b< working directory > Specifies the directory where files are temporarily stored.

-C adds a comment to each compressed file.

-d deletes the specified file from within the compressed file.

The directory name is not established within the-D compressed file.

-F The effect of this parameter is similar to specifying the "-u" parameter, but not only updates the existing file, and if some files do not already exist in the compressed file, use this parameter to add it to the compressed file.

-F attempt to repair a corrupted compressed file.

-G compresses the file after it is appended to the existing compressed file, rather than creating a new compressed file.

-H online Help.

-i< template style > compress only files that match the criteria.

-j saves only the file name and its contents, not any directory names.

-J Delete unnecessary data before compressing the file.

-K uses the file name in MS-DOS compatible format.

-L When compressing a file, replace the LF character with the LF+CR character.

-ll the LF+CR character into the LF character when compressing the file.

-L displays copyright information.

-M compresses the file and joins the compressed file, deletes the original file, and then moves the file to the compressed file.

-n< string > does not compress a file with a specific trailing string.

-O to compress files that have the most recent change time in the file, set the change time for the compressed file to be the same as the file.

-Q does not show the instruction execution process.

-R recursively handles all files and subdirectories under the specified directory.

-S contains the system and hidden files.

-t< Date Time > Set the date of the compressed file to the specified date.

-T checks that each file within the backup file is correct.

-U replace the newer file into the compressed file.

-V Displays the instruction execution process or displays version information.

-V Saves the file properties of the VMS operating system.

-W in the file name if the version number, this parameter is only valid under the VMS operating system.

-x< template style > exclude files that match the criteria when compressing.

-X does not save additional file attributes.

-Y saves the symbolic connection directly, not the file that the connection points to, and this parameter is only valid under systems such as UNIX.

-Z adds a comment to the compressed file.

-$ Save the volume book name of the disk where the first compressed file is located.

-< compression Efficiency > Compression efficiency is a value between 1-9.

Example:

1. Compressing ltmain.sh files

[Email protected] rrdtool-1.3.4]# zip test1.zip ltmain.sh

adding:ltmain.sh (deflated 75%)

[email protected] rrdtool-1.3.4]# ll ltmain.sh test1.zip

-rw-r--r--1 1003 1001 199991 Feb 8 ltmain.sh

-rw-r--r--1 root root 49771 Dec 13:52 test1.zip

2. Compression efficiency is 3 and 9, respectively.

[email protected] rrdtool-1.3.4]#zip test2.zip-3 ltmain.sh

[[email protected] rrdtool-1.3.4] #zip test2.zip-9 ltmain.sh

[email protected] rrdtool-1.3.4]# ll ltmain.sh test*.zip

-rw-r--r--1 1003 1001 199991 Feb 8 ltmain.sh

-rw-r--r--1 root root 49771 Dec 13:52 test1.zip

-rw-r--r--1 root root 56782 Dec 14:07 test2.zip

-rw-r--r--1 root root 49443 Dec 14:07 test3.zip

Note:

Compression ratio (Compression ratio), which describes the effect name of a compressed file, is the ratio of the size of the file after compression to the size before compression.

For example: The 100m file compression is 90m, the compression rate is 90/100*100%=90%, the compression rate is generally smaller the better, but the smaller the pressure, the longer the decompression time. Compression efficiency (compression efficiency) The larger the compressed file, the longer the decompression time.

3. All files and folders under the current directory are compressed into Test.zip file,-r means all files in the recursive compressed subdirectory

[Email protected] rrdtool-1.3.4]# zip-r test.zip./*

4. Package Directory

[Email protected] rrdtool-1.3.4]# zip test2.zip doc/*

5. Delete the makefile.am file in the compressed file Test.zip

[Email protected] rrdtool-1.3.4]# zip-d test.zip makefile.am

deleting:Makefile.am

6 . Add rrdtool.spec file to compressed file Test.zip

[Email protected] rrdtool-1.3.4]# zip-m test.zip rrdtool.spec

Updating:rrdtool.spec (deflated 68%)

7. Exclude a file when compressing a file

[Email protected] tar]# zip test3.zip rrdtool-1.3.4-x ltmain.sh

Unzip to be . zip Decompression program for compressed files

Parameters

-C Displays the extracted results to the screen and converts the characters appropriately.

-F Updates an existing file.

-L Displays the files contained within the compressed file.

-P, similar to the-c parameter, displays the results of the decompression to the screen, but does not perform any conversions.

-T checks whether the compressed file is correct, but does not understand the pressure.

-U is similar to the-f parameter, but in addition to updating existing files, other files in the compressed file are extracted to the directory.

-V performs yes when the detailed information is displayed. or view the compressed files directory, but do not press.

-Z Displays only the memo text of the compressed file.

-A necessary character conversion for the text file.

-B Do not convert the text file to character.

The file names in the-C compressed file are case sensitive.

-J does not handle directory paths that are contained in compressed files.

-L Changes all the file names in the compressed file to lowercase.

-M sends the output to the more program processing.

-N Do not overwrite the original file when extracting.

-O do not need to ask the user first, unzip overwrite the original file after execution.

-p< password > password using zip option.

-Q does not display any information when executing.

-S converts white space characters in the file name to baseline characters.

-V retains the file version information for the VMS.

-X Unzip while the original uid/gid of the file is stored back.

[. zip file] Specifies a. zip compressed file.

[file] Specifies which files in the. zip archive to process.

-d< directory > Specifies the directory to be stored after the file has been decompressed.

-x< file > Specifies which files in the. zip archive are not processed.

-Z unzip-z equals execute zipinfo instruction.

Example

1. Unzip the compressed file Text.zip in the current directory.

[Email protected] test]# Unzip Test.zip

2. Unzip the compressed file Text.zip in the specified directory/TMP, and if the same file exists, ask the unzip command not to overwrite the original file.

[Email protected] test]# unzip-n test.zip-d/tmp

3. View the compressed Files directory, but not the pressure.

[Email protected] test]# unzip-v test.zip

4. Extract the compressed file Test.zip in the specified directory TMP, if the same file exists, ask the unzip command to overwrite the original file.

[Email protected] test]# Unzip-o test.zip-d tmp/

5. Unzip all zip files in the current directory

[Email protected] test]# unzip "*.zip"

[[email protected] test]# ls *.zip | XARGS-N1 Unzip

Compression and decompression commands under Linux--zip/unzip