Use the -- delete parameter of rsync to delete unnecessary files in the target directory than in the source directory.

Recently, when processing planning resource files, you need to synchronize all the files in directory A to the files in directory B and delete all the unnecessary files in directory B. Therefore, you can use the -- delete parameter of rsync to implement the function.

Example:
// Create two test Directories
$ Mkdir {Dira, dirb}

// Create the corresponding files in the two directories respectively
$ Touch Dira/unzip filea1.txt,filea2.txt,filea3.txt}
$ Touch dirb/filea1.txt,filea2.txt,filea3.txt,fileb1.txt,fileb2.txt,fileb3.txt}

1) synchronize all Dira files to dirb, and retain the owner, group, and file permissions of the files.

$ Rsync-avz Dira/dirb/

Sending incremental file list
./
Filea1.txt
Filea2.txt
Filea3.txt

Sent 199 bytes encoded ed 72 bytes 542.00 Bytes/sec
Total size is 0 speedup is 0.00

2) synchronize all Dira files to dirb and delete unnecessary files in dirb.
$ Rsync-avz -- delete Dira/dirb/

Sending incremental file list
./
Deleting fileb3.txt
Deleting fileb2.txt
Deleting fileb1.txt
Filea1.txt
Filea2.txt
Filea3.txt
Sent 203 bytes encoded ed 72 bytes 550.00 Bytes/sec
Total size is 0 speedup is 0.00

3. Synchronize all dira's files to dirb, but delete all files except fileb3.txt in dirb.
$ Rsync-avz -- delete -- exclude "fileb3.txt" Dira/dirb/

Sending incremental file list
./
Deleting fileb2.txt
Deleting fileb1.txt
Filea1.txt
Filea2.txt
Filea3.txt

Sent 203 bytes encoded ed 72 bytes 550.00 Bytes/sec
Total size is 0 speedup is 0.00

In step 4, The filea1.txtand filea2.txt files in the diradirectory are not synchronized to the dirb directory.
$ Rsync-avz -- exclude = "filea1.txt" -- exclude = "filea2.txt" Dira/dirb/

Sending incremental file list
Filea3.txt

Sent 106 Bytes encoded ed 31 bytes 274.00 Bytes/sec
Total size is 0 speedup is 0.00

5) The filea1.txtand filea2.txt files in the diradirectory are not synchronized to the dirb directory, and redundant files are deleted from the dirb directory.
$ Rsync-avz -- exclude = "filea1.txt" -- exclude = "filea2.txt" -- delete Dira/dirb/

Sending incremental file list
Deleting fileb3.txt
Deleting fileb2.txt
Deleting fileb1.txt
Filea3.txt
Sent 106 Bytes encoded ed 31 bytes 274.00 Bytes/sec
Total size is 0 speedup is 0.00

The two excluded files are deleted.

$ Rsync-avz -- exclude = "filea1.txt" -- exclude = "filea2.txt" -- delete-excluded Dira/dirb/

Sending incremental file list
./
Deleting fileb3.txt
Deleting fileb2.txt
Deleting fileb1.txt
Deleting filea2.txt
Deleting filea1.txt
Filea3.txt

Sent 109 bytes encoded ed 34 bytes 286.00 Bytes/sec
Total size is 0 speedup is 0.00

Here, we can see that only filea3.txtis synchronized to the dirbdirectory. At the same time, filea1.txtand filea2.txt files in the dirbdirectory are also deleted.

Here, I would like to share my learning experience. Do not always learn how many functions are available when learning something. Select the functions you need based on your actual application scenarios. In this way, you will be impressed.

 

Http://www.linuxidc.com/Linux/2014-03/98835.htm

Use the -- delete parameter of rsync to delete unnecessary files in the target directory than in the source directory.