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SWAPON(8) Linux Programmer's Manual SWAPON(8)
swapon, swapoff - enable/disable devices and files for paging and swapping
/sbin/swapon [-h -V]
/sbin/swapon -a [-v] [-e]
/sbin/swapon [-v] [-p priority] specialfile ...
/sbin/swapoff [-h -V]
/sbin/swapoff specialfile ...
Swapon is used to specify devices on which paging and swapping are to take place. Calls
to swapon normally occur in the system multi-user initialization file /etc/rc making all
swap devices available, so that the paging and swapping activity is interleaved across
several devices and files.
Normally, the first form is used:
-h Provide help
-V Display version
-s Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not avail-
able before Linux 2.1.25.
-a All devices marked as ``swap'' swap devices in /etc/fstab are made available.
Devices that are already running as swap are silently skipped.
-e When -a is used with swapon, -e makes swapon silently skip devices that do not
Specify priority for swapon. This option is only available if swapon was compiled
under and is used under a 1.3.2 or later kernel. priority is a value between 0 and
32767. See swapon(2) for a full description of swap priorities. Add pri=value to
the option field of /etc/fstab for use with swapon -a.
Swapoff disables swapping on the specified devices and files. When the -a flag is given,
swapping is disabled on all known swap devices and files (as found in /proc/swaps or
You should not use swapon on a file with holes. Swap over NFS may not work.
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
/dev/hd?? standard paging devices
/dev/sd?? standard (SCSI) paging devices
/etc/fstab ascii filesystem description table
The swapon command appeared in 4.0BSD.
Linux 1.x 25 September 1995 SWAPON(8)
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