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Full Discussion: Rename file in directory using contents within each file
Top Forums UNIX for Beginners Questions & Answers Rename file in directory using contents within each file Post 303042502 by Scrutinizer on Friday 27th of December 2019 07:44:32 AM
Old 12-27-2019
Hi Ravinder,

As long as a mv operation is performed on the same file system - as is the case here - that should not pose a problem, since mv then only manipulates directory data: A file name is nothing more than a directory entry, a pointer (a hard link) to the file itself.

When a process opens a file for reading, the operation system creates an entry (file descriptor) to represent that file and stores information about that opened file in memory. So then the directory entry is no longer used.

The mv operation is thus free to manipulate the directory entry.

So for the process that has opened and is reading the file, nothing changes as the directory data is being changed.
When it is done reading it just closes the file descriptor.

Also, the file list expanded by the glob is expanded before being passed to the awk script, so new file names are not passed to the script.

S.
These 2 Users Gave Thanks to Scrutinizer For This Post:
cmccabe RavinderSingh13
 

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LEARN ABOUT CENTOS

vfs_crossrename

VFS_CROSSRENAME(8)					    System Administration tools 					VFS_CROSSRENAME(8)

NAME

       vfs_crossrename - server side rename files across filesystem boundaries

SYNOPSIS

       vfs objects = crossrename

DESCRIPTION

       This VFS module is part of the samba(7) suite.

       The vfs_crossrename VFS module allows server side rename operations even if source and target are on different physical devices. A "move"
       in Explorer is usually a rename operation if it is inside of a single share or device. Usually such a rename operation returns
       NT_STATUS_NOT_SAME_DEVICE and the client has to move the file by manual copy and delete operations. If the rename by copy is done by the
       server this can be much more efficient. vfs_crossrename tries to do this server-side cross-device rename operation.

       There are however limitations that this module currently does not solve:

	   The ACLs of files are not preserved,

	   meta data in EAs are not preserved,

	   renames of whole subdirectories cannot be done recursively, in that case we still return STATUS_NOT_SAME_DEVICE and let the client
	   decide what to do,

	   rename operations of huge files can cause hangs on the client because clients expect a rename operation to return fast.

       This module is stackable.

OPTIONS

       crossrename:sizelimit = BYTES
	   server-side cross-device-renames are only done for files if the filesize is not larger than the defined size in MiB to prevent
	   timeouts. The default sizelimit is 20 (MiB)

EXAMPLES

       To add server-side cross-device renames inside of a share for all files sized up to 50MB:

		   [testshare]
		path = /data/mounts
		vfs objects = crossrename
		crossrename:sizelimit = 50

VERSION

       This man page is correct for version 4.0.0 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

Samba 4.0							    06/17/2014							VFS_CROSSRENAME(8)
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