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Top Forums Shell Programming and Scripting Silly question - how does the "mv" command work? Post 302413659 by verdepollo on Friday 16th of April 2010 02:09:01 PM
Old 04-16-2010
Quote:
Originally Posted by jgt
If both directories are in the same file system only the inode table is updated, the file does not actually move
However the inode does not change when moving a file within the same filesystem:


Code:
$ ls -i file1
    139787 file1
$ mv file1 file2
$ ls -i file2
    139787 file2

Is the same as creating a hard link, and deleting the original reference:

Code:
$ ls -i file1
    139787 file1
$ ln file1 file2
$ rm file1
$ ls -i file2
    139787 file2


Quote:
Usually moving files within the same file system is not the same as copying and then removing the original. First a new link is added to the new directory then the original link is deleted. The data of file is not accessed. This is much it is faster than copy and remove. The file still has the same inode.

Last edited by verdepollo; 04-16-2010 at 03:23 PM.. Reason: Clarify
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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