Difference between cp and mv linux command Post: 302425086

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Top Forums Programming Difference between cp and mv linux command Post 302425086 by bigearsbilly on Thursday 27th of May 2010 07:16:23 AM

05-27-2010

Registered User

well, I suggest you read the source code for cp and mv

well, for a start, cp copies the file, so opens, reads and copies.
mv just moves or renames it. So the actual inode is not accessed,
only the Directory entries.

---------- Post updated at 12:16 PM ---------- Previous update was at 12:10 PM ----------

Quote:

Originally Posted by achenle

The mv command first deletes the target file if it exists. The cp command does not.

no that is wrong.

observe, if I mv (rename) a file the inode
does not change:

Code:

 
cat:$ls -i 1
82309 1
cat:$mv 1 2
cat:$ls -i 2
82309 2

if I do a cp the inodes actually change.

Code:

cat:$ls > 1
cat:$cp 1 2
cat:$ls -i 1 2
82964 1  82967 2

the inode is the physical disk block(s) where the file lives.
you have only updated the directory with a mv

bigearsbilly

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LEARN ABOUT SUNOS

gnomevfs-cat

gnomevfs-cat(1) 						   User Commands						   gnomevfs-cat(1)

NAME

       gnomevfs-cat - print a file to standard output using the VFS system

SYNOPSIS

       gnomevfs-cat URI

DESCRIPTION

       gnomevfs-cat prints a file to standard output using the virtual file system to access the file via a URI.

OPERANDS

       The following operands are supported:

       URI	       Specifies the file location in standard URI format.

EXAMPLES

       Example 1: Cat a File From a Web Server

       example% gnomevfs-cat http://www.sun.com

       Example 2: Cat a Local File

       example% gnomevfs-cat file:///home/user/README.txt

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables: NLSPATH.

EXIT STATUS

       The exit value 0 is returned regardless of success or failure.

FILES

       The following files are used by this application:

       /usr/bin/gnomevfs-cat   Executable to print a file to standard output using the VFS system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-vfs		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gnomevfs-copy(1), gnomevfs-info(1), gnomevfs-ls(1), gnomevfs-mkdir(1)

NOTES

       Written by Stephen Browne, Sun Microsystems Inc., 2004.

SunOS 5.10							    6 Sep 2004							   gnomevfs-cat(1)

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gnomevfs-cat