setfiles: add page (#18473)

Co-authored-by: Managor <[email protected]>

Author: pranlawate

pages/linux/setfiles.md

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+# setfiles
+
+> Set SELinux file security contexts based on policy rules.
+> Similar to `restorecon` but reads contexts from a file_contexts file.
+> See also: `restorecon`, `semanage-fcontext`, `fixfiles`.
+> More information: <https://manned.org/setfiles>.
+
+- Set file contexts according to the default policy file:
+
+`sudo setfiles /etc/selinux/targeted/contexts/files/file_contexts {{path/to/directory}}`
+
+- Set file contexts recursively and show changes:
+
+`sudo setfiles /etc/selinux/targeted/contexts/files/file_contexts {{path/to/directory}} {{[-v|--verbose]}}`
+
+- Preview what would be changed without actually modifying contexts:
+
+`sudo setfiles /etc/selinux/targeted/contexts/files/file_contexts {{path/to/directory}} {{[-n|--nochange]}}`
+
+- Set file contexts and verify them:
+
+`sudo setfiles /etc/selinux/targeted/contexts/files/file_contexts {{path/to/directory}} {{[-v|--verbose]}} {{[-F|--force]}}`
+
+- Use a specific root path for context matching:
+
+`sudo setfiles /etc/selinux/targeted/contexts/files/file_contexts {{path/to/new_directory}} {{[-r|--rootpath]}} {{path/to/old_directory}}`