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UNIX for Dummies Questions & Answers
awk script how to do it
Post 7038 by xiamin on Tuesday 18th of September 2001 04:57:45 AM
09-18-2001
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LEARN ABOUT DEBIAN
mkfs.cramfs
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)