SGD findf

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The findf command


This command can be used to determine which drive and partition a file is located on.

The result is stored in the variable out_device, which can be used by subsequent commands.

The find command stops after the first match is found.


findf filename1 [filename2...]

When specifying the file name include the path. See the example below.


Assume a system with the following hard drives:

  • hd0 partition 0: Windows
  • hd0 partition 3: Linux
  • hd1 partition 0: Linux

The command

findf /boot/grub/menu.lst /boot/menu.lst

will search the hard drives and when finding the /boot/grub/menu.lst on hd0,3 will set the out_device accordingly.

The result can be examined as follows:

echo $(out_device)

Technical details

Not only out_device is being set. These other variables are also set:

Problems that can be solved with this option

The findf command can be used to determine the drive designation of a USB drive programatically at runtime. See Samples of custom Boot Scripts for a working example on how to create a boot CD, which will determine the location of the USB drive automatically and boot the linux located on the drive.