System administration command. This simple backup utility accesses ext2 and ext3 file devices directly, quickly backing up files
without affecting file access times. files may be specified as a mount point or as a list of files and directories to back up. While you can
use this on a mounted system, dump may write corrupted information to the backup when the kernel has written only part of its
cached information. Dump maintains a record of which files it has saved in /etc/dumpdates, and will perform incremental backups
after creating an initial full backup. Use the restore command to restore a dump backup.
Linux Commad Options: -a Write until end-of-media. Default behavior when writing to tape drives. -A file
Create a table of contents for the archive in the specified file. -bblocksize
Block size in kilobytes to use in dumped records. By default, it is 10, or 32 when dumping to a tape with a density greater than 6250 bpi. -Bblocks
Specify number of blocks to write per volume. -c Treat target as a 1700-foot-long cartridge tape drive with 8000 bpi. Override end-of-media detection. -d density
Specify tape density. -D file
Write dump information to file instead of /etc/dumpdates. -E file
Exclude inodes specified in file. -f files
Write backup volumes to the specified files or devices. Use - to write to standard output. Separate multiple files with a comma. Use host:file or user@host:file to write to a networked host using either the rmt program or the program specified by the RMT environment variable. -F script
Run script at the end of each volume other than the last. dump will pass the current device and volume number to the script.
The script should return 0 to continue, 1 to prompt for a new tape, or any other exit value to abort the dump. The script will
run with the processes real user and group ID.
Specify a comma-separated list of inodes to skip. -I n
Ignore the first n read errors. dump ignores 32 read errors by default. Specify 0 to ignore all errors. You may need to do this when dumping a mounted filesystem. -j[level]
Compress each block using the bzlib library at the specified compression level. By default dump uses level 2 compression. -k Use Kerberos authentication when writing to a remote system. -L label
Write the specified volume label into the dump header. -m Save only metadata when backing up changed but not modified files. -M Create a multivolume backup. Treat any filename provided
with -f as a prefix. -n Use wall to notify members of group operator when prompting for information. -q Abort the backup instead of prompting for information when operator input is required. -Q file
Create Quick Access information in the specified file for use by restore. -s n
Write only n feet of tape in a single volume. Prompt for a new tape upon reaching this limit. -S Calculate and print the amount of space required to perform the backup, then exit. -T date
Only back up files changed or modified since date. This overrides the time given in /etc/dumpdates. -u Update /etc/dumpdates after completing the backup. -v Print verbose information about the dump. -W Generate a report on the backup status of all filesystems based on information in /etc/dumpdates and /etc/fstab. -w Generate a report of filesystems that need to be backed up.
Only report on filesystems listed in /etc/fstab and /etc/mtab that need to be backed up. -y Compress each block using the lzo library. -z[level]
Compress each block using the zlib library. If provided, use the specified compression level. The default is 2.