Linux rdev command

Linux Command Reference

The Linux rdev command can be used to query/set the root device, RAM disk size, or video mode of the kernel image file.

The rdev command without any arguments will output the /etc/mtab file line of the current root file system. ramsize, vidmode, and rootflags without any arguments will display help information.

Syntax

rdev [-rsvh ] [-o offset ] [ image [value [ offset ] ] ]</p>

However, depending on the parameters the user wants to set, the following methods are used as well:

rdev [ -o offset ] [ image [ root_device [ offset ] ] ]

swapdev [ -o offset ] [ image [ swap_device [ offset ] ] ]

ramsize [ -o offset ] [ image [ size [ offset ] ] ]

videomode [ -o offset ] [ image [ mode [ offset ] ] ]

rootflags [ -o offset ] [ image [ flags [ offset ] ] ]

Options：

• -r: Makes rdev run as ramsize.
• -R: Makes rdev run as rootflags.
• -v: Makes rdev run as vidmode.
• -h: Provides help.

Linux Command Reference