MKCRAMFS(8) Debian GNU/Linux Manual MKCRAMFS(8)NAME
mkcramfs - make a compressed ROM file system
SYNOPSIS
mkcramfs [-h] [-b blksize] [-e edition] [-i file] [-n name] dirname outfile
DESCRIPTION
This manual page documents briefly the mkcramfs command. This manual page was written for the Debian GNU/Linux distribution (but may be
used by others), because the original program does not have a manual page.
mkcramfs constructs a CramFs from the contents of dirname. The image of the resulting file system is placed in outfile.
OPTIONS -h Give a brief help message.
-E Make all warnings errors (non-zero exit status).
-b blksize
Set the block size of the generated file system.
-e edition
Set the edition number (part of fsid).
-i file
Insert a file image into the filesystem (requires Linux >= 2.4.0).
-n name
Set the name of the CramFs filesystem.
-p Pad by 512 bytes for boot code.
-s Sort directory entries (old option, ignored).
-v Turn on verbose mode.
-z Make explicit holes (requires Linux >= 2.3.39).
AUTHOR
mkcramfs is written by Linus Torvalds and Daniel Quinlan. Manual page added by Herbert Xu.
KERNEL SOURCE 2001 February 22th MKCRAMFS(8)
Check Out this Related Man Page
MKFS.CRAMFS(8) System Administration MKFS.CRAMFS(8)NAME
mkfs.cramfs - make compressed ROM file system
SYNOPSIS
mkfs.cramfs [options] directory file
DESCRIPTION
Files on cramfs file systems are zlib-compressed one page at a time to allow random read access. The metadata is not compressed, but is
expressed in a terse representation that is more space-efficient than conventional file systems.
The file system is intentionally read-only to simplify its design; random write access for compressed files is difficult to implement.
cramfs ships with a utility (mkcramfs) to pack files into new cramfs images.
File sizes are limited to less than 16 MB.
Maximum file system size is a little under 272 MB. (The last file on the file system must begin before the 256 MB block, but can extend
past it.)
ARGUMENTS
The directory is simply the root of the directory tree that we want to generate a compressed filesystem out of.
The file will contain the cram file system, which later can be mounted.
OPTIONS -v Enable verbose messaging.
-E Treat all warnings as errors, which are reflected as command return value.
-b blocksize
Use defined block size, which has to be divisible by page size.
-e edition
Use defined file system edition number in superblock.
-N big, little, host
Use defined endianness. Value defaults to host.
-i file
Insert a file to cramfs file system.
-n name
Set name of the cramfs file system.
-p Pad by 512 bytes for boot code.
-s This option is ignored. Originally the -s turned on directory entry sorting.
-z Make explicit holes.
-h, --help
Display help text and exit.
-V, --version
Display version information and exit.
EXIT STATUS
0 success
8 operation error, such as unable to allocate memory
SEE ALSO fsck.cramfs(8), mount(8)AVAILABILITY
The example command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux April 2013 MKFS.CRAMFS(8)
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