UML_MKCOW(1) General Commands Manual UML_MKCOW(1)
uml_mkcow -- create a new COW file
uml_mkcow [-f] [COW_file] [backing_file]
This manual page documents briefly the uml_mkcow command.
This manual page was written for the Debian GNU/Linux distribution
because the original program does not have a manual page. Instead, it
has documentation in HTML format; see below.
uml_mkcow is a small utility to create COW (Copy-On-Write) files with-
out the need to run the full UML kernel.
NOTE: you can save a lot of disk space using COW files. When checking
the size of the COW file in order to see the gobs of space that you're
saving, make sure you use 'ls -ls' to see the actual disk consumption
rather than the length of the file. The COW file is sparse, so the
length will be very different from the disk usage.
-f Force overwrite of an exsiting COW file.
Create a new COW file:
uml_mkcow rootfs_COW rootfs
Overwrite (destroying) an existing COW file:
uml_mkcow -f rootfs_COW rootfs
The UserModeLinux-HOWTO (link to URL http://user-mode-linux.source-
uml_mkcow was written by Steve Schnepp.
This manual page was written by Mattia Dongili firstname.lastname@example.org for
the Debian GNU/Linux system, based on material in the UserModeLinux-
HOWTO by Rusty Russell.