The default is not to use any lock at all, but it’s recommended to avoid collisions with udevd or other tools. This option overwrites environment variable $LOCK_BLOCK_DEVICE.
If the mode argument is omitted, it defaults to "yes". The optional argument mode can be yes, no (or 1 and 0) or nonblock. Use exclusive BSD lock for device or file it operates. This is required in order to erase a partition-table signature on a block device. For more details see the EXAMPLE section.įorce erasure, even if the filesystem is mounted. The set of erased signatures can be restricted with the -t option.Ĭreate a signature backup to the file $HOME/wipefs-.bak. Note that by default wipefs does not erase nested partition tables on non-whole disk devices. In this case the wipefs scans the device again after each modification (erase) until no magic string is found. When option -a is used, all magic strings that are visible for libblkid are erased. The wipefs command (since v2.31) lists all the offset where a magic strings have been detected. Note that some filesystems and some partition tables store more magic strings on the device (e.g., FAT, ZFS, GPT). The ioctl is called as the last step and when all specified signatures from all specified devices are already erased. Wipefs calls the BLKRRPART ioctl when it has erased a partition-table signature to inform the kernel about the change. Always explicitly define expected columns by using -output columns-list in environments where a stable output is required. So whenever possible, you should avoid using default outputs in your scripts. When used without any options, wipefs lists all visible filesystems and the offsets of their basic signatures. wipefs does not erase the filesystem itself nor any other data from the device. Wipefs can erase filesystem, raid or partition-table signatures (magic strings) from the specified device to make the signatures invisible for libblkid. Wipefs - wipe a signature from a device SYNOPSIS The wipefs command is part of the util-linux package and is available from. Restores an ext2 signature from the backup file ~/wipefs-sdb-0x00000438.bak. EXAMPLESĮrases all signatures from the device /dev/sdb and creates a signature backup file ~/wipefs-sdb-.bak for each signature.ĭd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb seek=$((0x00000438)) bs=1 For more details see mount(8).ĭisplay version information and exit. The list or individual types can be prefixed with ’no’ to specify the types on which no action should be taken. More than one type may be specified in a comma-separated list. Limit the set of printed or erased signatures. Suppress any messages after a successful signature wipe. Encode all potentially unsafe characters of a string to the corresponding hex value prefixed by ’\x’. Print out in parsable instead of printable format. "K" has the same meaning as "KiB"), or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB. The offset argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is optional, e.g. It is possible to specify multiple -o options. The offset number may include a "0x" prefix then the number will be interpreted as a hex value. Specify the location (in bytes) of the signature which should be erased from the device. This is required in order to erase a partition-table signature on a block device.Ĭauses everything to be done except for the write() call. For more details see the EXAMPLES section.įorce erasure, even if the filesystem is mounted. The set of erased signatures can be restricted with the −t option.Ĭreate a signature backup to the file $HOME/wipefs-.bak.
It is possible that after a wipefs -o offset the same filesystem or partition table will still be visible because of another magic string on another offset. The device is not scanned for additional magic strings for the same filesystem. The wipefs command lists only the first offset where a magic string has been detected. Note that some filesystems and some partition tables store more magic strings on the device.
Wipefs does not erase the filesystem itself nor any other data from the device. Wipefs − wipe a signature from a device SYNOPSIS
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