Compress files for flash filesystems


deflate [options] [filename]...

Runs on:



-b size
The compression block size; one of 4K, 8K, 16K or 32K (default: 8K). The K is assumed; you don't need to specify it.
-o fname
The output filename. A filename of - means standard output. By default, deflate compresses the files in place.
Inflate files (default: deflate).
-t 1|2
The compression type; the default is 2. For a comparison of the types, see below.
Be verbose; list information on each file as it's compressed.
The files to compress. If no files are given and the -i option is specified, deflate reads from standard input and writes to standard output, allowing it to be used as a filter.


The deflate utility compresses files for a flash filesystem. It's intended to be used in conjunction with the filter attribute for mkefs. It can also be used to precompress files intended for a flash filesystem.

The compression types (specified with the -t option) are:

Type Compression Speed Decompression Speed Compression Amount
1 Fast Very fast 30% on executables
2 Slow Fast 45% on executables


Deflate all executables that are to be placed on an embedded target:

deflate -v /target/bin/* /target/lib/*

Inflate a previously deflated file:

deflate -i deflated_file

Deflate file without changing the input file:

deflate -o file.dfl file

See also:


"Flash filesystems (devf-*)" in the Utilities Summary