Dump (program)
Encyclopedia
dump is a Unix
program
used to back up
file systems. It operates on blocks
, below filesystem abstractions such as files and directories. Dump can back up a file system to a tape or another disk. It is often used across a network by piping
its output through bzip2
then SSH
.
A dump utility first appeared in Version 6 AT&T UNIX.
[-D dumpdates] [-d density] [-f file | -P pipecommand] [-h level]
[-s feet] [-T date] filesystem
dump -W | -w
Unix
Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...
program
Computer program
A computer program is a sequence of instructions written to perform a specified task with a computer. A computer requires programs to function, typically executing the program's instructions in a central processor. The program has an executable form that the computer can use directly to execute...
used to back up
Backup
In information technology, a backup or the process of backing up is making copies of data which may be used to restore the original after a data loss event. The verb form is back up in two words, whereas the noun is backup....
file systems. It operates on blocks
Block (data storage)
In computing , a block is a sequence of bytes or bits, having a nominal length . Data thus structured are said to be blocked. The process of putting data into blocks is called blocking. Blocking is used to facilitate the handling of the data-stream by the computer program receiving the data...
, below filesystem abstractions such as files and directories. Dump can back up a file system to a tape or another disk. It is often used across a network by piping
Pipeline (Unix)
In Unix-like computer operating systems , a pipeline is the original software pipeline: a set of processes chained by their standard streams, so that the output of each process feeds directly as input to the next one. Each connection is implemented by an anonymous pipe...
its output through bzip2
Bzip2
bzip2 is a free and open source implementation of the Burrows–Wheeler algorithm. It is developed and maintained by Julian Seward. Seward made the first public release of bzip2, version 0.15, in July 1996.-Compression efficiency:...
then SSH
Secure Shell
Secure Shell is a network protocol for secure data communication, remote shell services or command execution and other secure network services between two networked computers that it connects via a secure channel over an insecure network: a server and a client...
.
A dump utility first appeared in Version 6 AT&T UNIX.
Usage
dump [-0123456789acLnSu] [-B records] [-b blocksize] [-C cachesize][-D dumpdates] [-d density] [-f file | -P pipecommand] [-h level]
[-s feet] [-T date] filesystem
dump -W | -w
External links
- Home page of the Linux Ext2 filesystem dump/restore utilities
- Torture-testing Backup and Archive Programs
- FreeBSD manpage
- A Brief tutorial on Dump/Restore - "A simple look at using dump and restore to back up and restore your data."