Linux rdev command

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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 parameters will output the current root filesystem's /etc/mtab file line. ramsize, vidmode, and rootflags without any parameters will display help information.

Syntax

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

However, as the parameters to be set by the user vary, the following method is the same:

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 ] ] ]

Parameters：

• -r： Run rdev as ramsize.
• -R： Run rdev as rootflags.
• -v： Run rdev as vidmode.
• -h： Provide Help.

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