Mv

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mv (short for m o v e) is a Unix command that moves one or more files or directories from one place to another. If both file names are in the same file system, this results in a simple file name change; otherwise, the contents of the file will be copied to the new location and the old file deleted. Using mv requires the user to have write permission for the directory the file will move in between. This is because mv changed the contents of both directories ( i.e. , source and target) involved in the move. When using mv commands on files located in the same file system, the timestamp of the file is not updated.

On UNIX implementations derived from AT & amp; T UNIX, cp , ln and mv are implemented as one program with hard-link binaries. The behavior is selected from the last path component name in argv [0] . This is a common technique where closely related commands that have been packaged as units allow the user to specify a particular action from the intended action.

Video Mv

Violate existing files

When the file name is moved to an existing file name, the existing file is deleted. If the existing file can not be written but in a writable directory, the mv command asks for confirmation (if run from the terminal) before continuing, unless the -f (force) option is used.

Maps Mv

Move versus copy and delete

Moving the files in the same file system is generally implemented differently than copying the files and then deleting the originals. On platforms that do not support syscall rename, new links are added to the new directory and the original is removed. The file data is not accessed. All POSIX-conformant systems implements calls rename .

An actual step ( viz. , a name) is dramatically faster than a circular copy-and-move procedure. The i-number file (short for "i-node number") does not change. No permissions are required to read the file being moved so far - conceptually - it's just catalog information being changed as a result of "step." Because the source and target directory are being changed, to be, the entry is being created in the target directory and deleted from within the source directory, "write" permissions in both directories are required to complete the step. Moving files from one file system to another can fail completely or can be automatically performed as a copy action and remove the atom; the actual details depend on the implementation.

The write permission on the additional migrated (so to speak) directory is required in cases where the directory is being re-enlarged, sciz. , move to a different parent directory. This is because the ".." entry - which can always be used as an "alias" for their parents if you do not know the name of the parent - should be changed in migrants per se .

"Renaming" directories from within one parent to a different parent requires write permission in the named directory, apart from permission to modify new parent and parent. This is because the i-number for directory entries ".." (which can be used in any context as an alias for the parent of the current directory) changes as a result of renaming.

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Options

Most versions of mv support:

• -i I process in a nteractive way, write a standard error message before moving a file that will overwrite the existing file. If the response from the standard input begins with either `` or `Y 'characters, the step is attempted. (Override the previous -f or -n option.)
• -f f orce overrides the destination (overriding the previous -i or -n options).

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Example

Note that, in the above example, /mnt refers to the directory ("mount point") where the given file system is installed. Naming directories like that /mnt is a popular convention but is by no means necessary. A "file system" can be regarded as an independent tree that is logically regarded as a unit; the root is "installed" above the administrator's choice directory. The previous content of that directory is not visible, but they are "restored" when new volumes are released.

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See also

• cp
• ln
• rm
• List of Unix programs
• move (command)
• ren (command)

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References

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External links

• mv : Ã, move files-Commands & amp; Utility Reference, UNIX Single Specification, Issue 7 of Open Group

Source of the article : Wikipedia