cpio: add page

pages/common/cpio.md

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+# cpio
+
+> Archiving utility.
+
+- Create an archive from files
+
+`echo "{{file1}} {{file2}} {{file3}}" | cpio -ov > {{archive.cpio}}`
+
+- Create an archive from a directory
+
+`find {{directory}} | cpio -ov > {{archive.cpio}}`
+
+- Extract an archive
+
+`cpio -idv < {{archive.cpio}}`
+