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Top Forums Shell Programming and Scripting Silly question - how does the "mv" command work? Post 302413629 by jgt on Friday 16th of April 2010 12:01:44 PM
Old 04-16-2010
If both directories are in the same file system only the inode table is updated, the file does not actually move

---------- Post updated at 12:01 PM ---------- Previous update was at 11:54 AM ----------

Quote:
However, I have a feeling that this "other program" is grabbing this file too soon as the "mv" hasn't successfully completed writing the files contents; perhaps just the filename.
If the two directories involved in the mv are on different file systems, the a copy and delete is done
However, unix systems will show the file in a ls as soon as it is opened for writing, so your second program should confirm that the file is not in use (use fuser), otherwise you may process a partial file.
 

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mv(1)							      General Commands Manual							     mv(1)

Name
       mv - move or rename files

Syntax
       mv [-i] [-f] [-] file1 file2

       mv [-i] [-f] [-] file... directory

Description
       The command moves (changes the name of) file1 to file2.

       If  file2  already  exists,  it is removed before file1 is moved.  If file2 has a mode which forbids writing, prints the mode and reads the
       standard input to obtain a line.  If the line begins with y, the move takes place.  If it does not, exits.  For further information, see

       In the second form, one or more files (plain files or directories) are moved to the directory with their original file-names.

       The command refuses to move a file onto itself.

Options
       -		   Interprets all following arguments as file names to allow file names starting with a minus.

       -f		   Force. This option overrides any mode restrictions or the -i switch.

       -i		   Interactive mode.  If a move is to supersede an existing file, the system prompts youw with the name of the	file  fol-
			   lowed  by  a question mark.	If you type a string that begins with y, the move occurs.  If you type any other response,
			   the move does not occur.

Restrictions
       If file1 and file2 lie on different file systems, must copy the file and delete the original.  In this case the owner name becomes that	of
       the copying process and any linking relationship with other files is lost.

See Also
       cp(1), ln(1)

																	     mv(1)
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