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Linux rdev Command

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 /etc/mtab file line of the current root file system. The ramsize, vidmode, and rootflags commands without any parameters will display help information.

Syntax

rdev [-rsvh] [-o offset] [image [value [offset]]]

However, depending on the parameter the user wants to set, the following methods are also equivalent:

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

Linux Command Manual

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