Linux dump command

Linux Command Encyclopedia

The Linux dump command is used to back up file systems.

dump is a backup utility program that can back up directories or the entire file system to a specified device, or into a single large file.

Syntax

dump [-cnu][-0123456789][-b <区块大小>][-B <区块数目>][-d <密度>][-f <设备名称>][-h <层级>][-s <磁带长度>][-T <日期>][目录或文件系统] 或 dump [-wW]

Parameters：

• -0123456789 　Backup level.
• -b<block size> 　Specify the block size, in KB.
• -B<number of blocks> 　Specify the number of blocks for the backup volume.
• -c 　Modify the preset density and capacity of the backup tape.
• -d<density> 　Set the tape density. The 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 the user will not be backed up.
• -n 　Notify all users in the "operator" group when the backup work requires administrator intervention.
• -s<tape length> 　The length of the backup tape, in feet.
• -T<date> 　Specify the time and date to start the backup.
• -u 　After the backup is complete, record the backed-up file system, level, date, time, etc. in /etc/dumpdates.
• -w 　Similar to -W, but only displays files that need to be backed up.
• -W 　Display the files that need to be backed up and the level, time, and date of their last backup.

Examples

Back up files to tape

# dump -0 -u /dev/tape /home/

The "-0" parameter specifies the backup level, and "-u" requires that the corresponding information be stored in the file /etc/dumpdates as a record after the backup is completed.

Linux Command Encyclopedia