cpio: add detailed description about archive format

pages/common/cpio.md

@@ -1,15 +1,16 @@
 # cpio
 
-> Copies files to and from archives.
+> Copies files in and out of archives.
+> Supports following archive formats: binary, old ASCII, new ASCII, crc, HPUX binary, HPUX old ASCII, old tar, and POSIX.1 tar.
 
-- Take a list of file names from standard input and creates an archive from them:
+- Take a list of file names from standard input and copy them [o]ut to an archive in binary format:
 
-`echo "{{file1}} {{file2}} {{file3}}" | cpio -o > {{[o]utput_archive.cpio}}`
+`echo "{{file1}} {{file2}} {{file3}}" | cpio -o > {{archive.cpio}}`
 
-- Create an archive containing all the files and folders in a directory in [v]erbose mode:
+- Copy [o]ut all files and folders in a directory to an archive, in [v]erbose mode:
 
-`find {{path/to/directory}} | cpio -ov > {{[o]utput_archive.cpio}}`
+`find {{path/to/directory}} | cpio -ov > {{archive.cpio}}`
 
-- Extract files from an archive, generating [d]irectories where needed, in [v]erbose mode:
+- Copy [i]n all files from an archive, generating [d]irectories where needed, in [v]erbose mode:
 
-`cpio -idv < {{[i]nput_archive.cpio}}`
+`cpio -idv < {{archive.cpio}}`