rm not need files

doc/design/file_manager/pfs/cp.md

-# Name  
-cp - copy files
-
-# Synopsis
-```
-cp [-r] [-f | -n] [-v] [--preserve--links] <LocalPath> <PFSPath>
-cp [-r] [-f | -n] [-v] [--preserve--links] <LocalPath> ... <PFSPath>
-cp [-r] [-f | -n] [-v] [--preserve--links] <PFSPath> <LocalPath> 
-cp [-r] [-f | -n] [-v] [--preserve--links] <PFSPath> ... <LocalPath>
-cp [-r] [-f | -n] [-v] [--preserve--links] <PFSPath> <PFSPath> 
-cp [-r] [-f | -n] [-v] [--preserve--links] <PFSPath> ... <PFSPath>
-```
-
-# Description
-```	   
-The following options are available:
-
--r
-   Copy directories recursively
-   
--f      
-	Do not prompt for confirmation before overwriting the destination path.  (The -f option overrides previous -n options.)
-
--n      
-	Do not overwrite an existing file.  (The -n option overrides previous -f options.)
-
--v      
-	Cause cp to be verbose, showing files after they are copied.
-
---preserve--links
-   Reserve links when copy links
-```
-
-# Examples
-- The following command copies a single file to pfs
-
-```
-paddle pfs cp ./text1.txt /pfs/$DATACENTER/home/$USER/text1.txt
-```
-
-- The following command copies pfs file to a local file
-
-```
-paddle pfs cp /pfs/$DATACENTER/home/$USER/text1.txt ./text1.txt
-```

doc/design/file_manager/pfs/ls.md

-# Name  
-ls - list directory(ies)'s contents or file(s)'s attributes
-
-# Synopsis
-`ls [-r] <PFSPath> ...`
-
-# Description
-
-```
-The following options are available:
-       
--r
-   List directory(ies) recursively
-```
-
-# Examples
-- The following command lists a single file
-
-```
-paddle pfs ls  /pfs/$DATACENTER/home/$USER/text1.txt
-```
-
-- The following command lists directory contents
-
-```
-paddle pfs ls  / /pfs/$DATACENTER/home/$USER/folder
-```

doc/design/file_manager/pfs/mkdir.md

-# Name  
-mkdir  - mkdir directory(ies)
-
-# Synopsis
-`mkdir <PFSPath> ...`
-
-# Description
-Create the pfs directory(ies), if it(they) does(do) not already exist. And create intermediate directories as required.
-
-# Examples
-```
-paddle pfs mkdir  /pfs/$DATACENTER/home/$USER/folder
-```

doc/design/file_manager/pfs/mv.md

-# Name  
-mv - move (rename) files
-
-
-# Synopsis
-```
-mv [-f | -n] [-v] <LocalPath> <PFSPath>
-mv [-f | -n] [-v] <LocalPath> ... <PFSPath>
-mv [-f | -n] [-v] <PFSPath> <LocalPath> 
-mv [-f | -n] [-v] <PFSPath> ... <LocalPath> 
-mv [-f | -n] [-v] <PFSPath> <PFSPath> 
-mv [-f | -n] [-v] <PFSPath> ... <PFSPath> 
-```
-
-# Description
-```
-The following options are available:
-
--f      
-	Do not prompt for confirmation before overwriting the destination path.  (The -f option overrides previous -n options.)
-
--n      
-	Do not overwrite an existing file.  (The -n option overrides previous -f options.)
-
--v      
-	Cause mv to be verbose, showing files after they are moved.
-```
-
-# Examples
-- The following command moves a single file to pfs
-
-```
-paddle pfs mv ./text1.txt /pfs/$DATACENTER/home/$USER/text1.txt
-```

doc/design/file_manager/pfs/rm.md

-# Name  
-rm - remove files or directories
-
-# Synopsis
-```
-rm [-r] [-v] <PFSPath> ...
-```
-
-# Description
-
-```
-The following options are available:
-
--r 
-	remove directories and their contents recursively
-	
--v      
-	Cause rm to be verbose, showing files after they are removed.
-```
-
-# Examples
-- The following command deletes a single file:
-
-```
-paddle pfs rm /pfs/$DATACENTER/home/$USER/test1.txt
-```
-
-- The following command deletes a  directory recursively:
-
-```
-paddle pfs rm -r /pfs/$DATACENTER/home/$USER/folder
-```

doc/design/file_manager/pfs/sync.md

-# Name  
-sync - sync directories. Recursively copies new and updated files from the source directory to the destination.
-
-# Synopsis
-``` 
-sync [--preserve--links] [-v] <LocalPath> <PFSPath> 
-sync [--preserve--links] [-v] <PFSPath> <LocalPath> 
-sync [--preserve--links] [-v] <PFSPath> <PFSPath>`
-```
-
-# Description
-
-```
-The following options are available:
-
---preserve--links
-   Reserve links when copy links.
-   
--v 
-	Cause sync to be verbose, showing files after their's synchronization is complete.
-```
-
-# Examples
-- The following command sync locally directory to pfs.
-
-```
-paddle pfs sync ./dir1 /pfs/$DATACENTER/home/$USER/mydir1
-```
-
-- The following command sync pfs directory to local.
-
-```
-paddle pfs sync /pfs/$DATACENTER/home/$USER/mydir1 .
-```