lz4: add page (#2125)

pages/common/lz4.md

@@ -0,0 +1,27 @@
+# lz4
+
+> Compress or decompress .lz4 files.
+
+- Compress a file:
+
+`lz4 {{file}}`
+
+- Decompress a file:
+
+`lz4 -d {{file.lz4}}`
+
+- Decompress a file and write to stdout:
+
+`lz4 -dc {{file.lz4}}`
+
+- Package and compress a directory and its contents:
+
+`tar cvf - {{path/to/dir}} | lz4 - {{dir.tar.lz4}}`
+
+- Decompress and unpack a directory and its contents:
+
+`lz4 -d {{dir.tar.lz4}} | tar -xv`
+
+- Compress a file using the best compression:
+
+`lz4 -9 {{file}}`