#Bash 的 mkfs.cramfs 命令

mkfs.cramfs [OPTION]... DIRECTORY FILE

功能

制作压缩的 ROM 文件系统。

类型

可执行文件（/usr/sbin/mkfs.cramfs），属于 util-linux。

参数

OPTIONS 选项：
- -v - 打印详细信息
- -E - 将所有警告视为错误
- -b blocksize - 块大小
- -e edition - 在超级块中使用已定义的文件系统版本号
- -N big, little, host - 指定字节序；默认值为主机字节序
- -i file - 将 file 文件插入 cramfs 的元数据中
- -n name - 设置文件系统的名称
- -p - 为引导填充 512 字节
- -s - ~~启用目录条目排序~~；废弃选项，被忽略
- -z - 显式空洞
- -l[=mode] - 对操作的设备或文件使用独占 BSD 锁
  - yes - 对设备加锁，如果锁被占用，则阻塞等待；省略 mode 时默认为 yes
  - no - 不对设备加锁；没有 --lock 选项时默认不加锁
  - nonblock - 对设备加锁，如果锁被占用，则失败
- -h, --help - 显示帮助
- -V, --version - 显示版本
DIRECTORY - 要压缩的目录
FILE - 存储镜像的文件

#示例

$ mkfs.cramfs dir image.img                 # 将 dir 目录压缩打包成 image.img

#相关命令

命令	说明
mkfs	创建 Linux 文件系统
fsck.cramfs	检查并修复压缩 ROM 文件系统

#推荐阅读

#手册

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(8)) 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 exit
           status.

       -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.

       -l[=mode]
           Use exclusive BSD lock for device or file it operates. The optional
           argument mode can be yes, no (or 1 and 0) or nonblock. If the mode
           argument is omitted, it defaults to "yes". This option overwrites
           environment variable $LOCK_BLOCK_DEVICE. The default is not to use
           any lock at all, but it’s recommended to avoid collisions with
           udevd or other tools.

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

EXIT STATUS
       0
           success

       8
           operation error, such as unable to allocate memory

SEE ALSO
       fsck.cramfs(8), mount(8)

REPORTING BUGS
       For bug reports, use the issue tracker at
       https://github.com/util-linux/util-linux/issues.

AVAILABILITY
       The mkfs.cramfs command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.39.3                 2023-11-21                    MKFS.CRAMFS(8)

#Bash 的 mkfs.cramfs 命令

#示例

#相关命令

#推荐阅读

#手册

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