gunzip: add page (#909)

pages/common/gunzip.md

@@ -0,0 +1,15 @@
+# gunzip
+
+> Extract file(s) from a gzip (.gz) archive.
+
+- Extract a file from the archive replacing the original file:
+
+`gunzip {{archive.tar.gz}}`
+
+- Extract file to a target destination:
+
+`gunzip -c {{archive.tar.gz}} > {{archive.tar}}`
+
+- List of contents of the compressed file:
+
+`gunzip -l {{file.txt.gz}}`