Linux dump command
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The Linux dump command is used to back up the file system.
dump is a backup utility program that can back up directories or the entire file system to a specified device, or back up to a large file.
Syntax
dump [-cnu][-0123456789][-b <block size>][-B <block number>][-d <density>][-f <device name>][-h <level>][-s <tape length>][-T <date>][Directory or Filesystem] Or dump [-wW]
Parameters:
- -0123456789 Backup level.
- -b<block size> Specify the block size, in KB.
- -B<block number> Specify the number of blocks in the backup volume.
- -c Modify the default density and capacity of the backup tape.
- -d<density> Set the tape density. Unit is BPI.
- -f<device name> Specify the backup device.
- -h<level> When the backup level is equal to or greater than the specified level, files marked as "nodump" by users will not be backed up.
- -n When the backup job requires administrator intervention, notify all users in the "operator" group.
- -s<tape length> Backup tape length, in feet.
- -T<date> Specify the start time and date of the backup.
- -u After the backup is completed, in/etc/dumpdates records the backed up filesystem, level, date, and time, etc.
- -w Similar to-W similar, but only displays the files to be backed up.
- -W Displays the files to be backed up and their last backup level, time, and date.
Online Examples
Backup files to tape
# dump -0 -u /dev/tape /home/
Among them"-0"parameter specifies the backup level"-u"After the backup is completed, store the corresponding information in a file" /etc/dumpdates for record keeping
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