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1 lz4(1) -- lz4, unlz4, lz4cat - Compress or decompress .lz4 files
5 --------
7 `lz4` [*OPTIONS*] [-|INPUT-FILE] <OUTPUT-FILE>
9 `unlz4` is equivalent to `lz4 -d`
11 `lz4cat` is equivalent to `lz4 -dcfm`
15 (`lz4 -d` or `lz4 -dc`) instead of the names `unlz4` and `lz4cat`.
19 -----------
22 based on **byte-aligned LZ77** family of compression scheme.
24 multi-core CPUs.
26 typically reaching RAM speed limit on multi-core systems.
34 * `lz4` compresses a single file by default (see `-m` for multiple files)
36 * `lz4 file.lz4` will default to decompression (use `-z` to force compression)
38 * `lz4` shows real-time notification statistics
40 (use `-q` to silence them)
48 `-c` ensures that output will be `stdout`.
49 Conversely, providing a destination name, or using `-m`
52 Default behaviors can be modified by opt-in commands, detailed below.
54 * `lz4 -m` makes it possible to provide multiple input filenames,
56 Progress notifications become disabled by default (use `-v` to enable them).
59 * Similarly, `lz4 -m -d` can decompress multiple `*.lz4` files.
60 * It's possible to opt-in to erase source files
61 on successful compression or decompression, using `--rm` command.
62 * Consequently, `lz4 -m --rm` behaves the same as `gzip`.
76 -------
80 In some cases, some options can be expressed using short command `-x`
81 or long command `--long-word`.
83 For example, `-d -c` is equivalent to `-dc`.
93 * `-z` `--compress`:
97 (for example, `unlz4` implies `--decompress`),
99 (for example, a file extension `.lz4` implies `--decompress` by default).
100 `-z` can also be used to force compression of an already compressed
103 * `-d` `--decompress` `--uncompress`:
105 `--decompress` is also the default operation when the input filename has an
108 * `-t` `--test`:
113 * `-b#`:
116 * `--list`:
118 note : current implementation is limited to single-frame .lz4 files.
122 * `-#`:
128 Speed/compression trade-off will vary depending on data to compress.
131 * `--fast[=#]`:
132 Switch to ultra-fast compression levels.
136 Similarly, if a compression level is set after `--fast`, it overrides it.
138 * `--best`:
139 Set highest compression level. Same as -12.
141 * `--favor-decSpeed`:
144 while decompression speed will be improved by 5-20%, depending on use cases.
147 * `-D dictionaryName`:
153 * `-f` `--[no-]force`:
158 When used with `--decompress` and `lz4` cannot recognize the type of
160 This allows `lz4cat --force` to be used like `cat (1)` for files
163 * `-c` `--stdout` `--to-stdout`:
166 * `-m` `--multiple`:
171 `lz4 -m` has a behavior equivalent to `gzip -k`
174 * `-r` :
176 This mode also sets `-m` (multiple input files).
178 * `-B#`:
179 Block size \[4-7\](default : 7)<br/>
180 `-B4`= 64KB ; `-B5`= 256KB ; `-B6`= 1MB ; `-B7`= 4MB
182 * `-BI`:
185 * `-BD`:
188 * `--[no-]frame-crc`:
191 * `--[no-]content-size`:
197 * `--[no-]sparse`:
200 * `-l`:
202 Note : `-l` is not compatible with `-m` (`--multiple`) nor `-r`
206 * `-v` `--verbose`:
209 * `-q` `--quiet`:
210 Suppress warnings and real-time statistics;
213 * `-h` `-H` `--help`:
216 * `-V` `--version`:
219 * `-k` `--keep`:
222 * `--rm` :
225 * `--` :
231 * `-b#`:
234 * `-e#`:
237 * `-i#`:
238 Minimum evaluation time in seconds \[1-9\] (default : 3)
242 ----
248 ------