matchpathcon, secon: add page (#12841)

* matchpathcon: add page

* secon: add page

* Explicitly state "absolute path"

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/linux/matchpathcon.md

@@ -0,0 +1,17 @@
+# matchpathcon
+
+> Lookup the persistent SELinux security context setting of a path.
+> See also: `semanage-fcontext`, `secon`, `chcon`, `restorecon`.
+> More information: <https://manned.org/man/matchpathcon.8>.
+
+- Lookup the persistent security context setting of an absolute path:
+
+`matchpathcon {{/path/to/file}}`
+
+- Restrict lookup to settings on a specific file type:
+
+`matchpathcon -m {{file|dir|pipe|chr_file|blk_file|lnk_file|sock_file}} {{/path/to/file}}`
+
+- [V]erify that the persistent and current security context of a path agree:
+
+`matchpathcon -V {{/path/to/file}}`