/usr/share/acl2-6.3/books/data-structures/array1.cert is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | (IN-PACKAGE "ACL2")
"ACL2 Version 6.3"
:BEGIN-PORTCULLIS-CMDS
:END-PORTCULLIS-CMDS
NIL
(("/usr/share/acl2-6.3/books/data-structures/array1.lisp" "array1" "array1" ((:SKIPPED-PROOFSP) (:AXIOMSP) (:TTAGS)) . 1391913622) ("/usr/share/acl2-6.3/books/data-structures/doc-section.lisp" "doc-section" "doc-section" ((:SKIPPED-PROOFSP) (:AXIOMSP) (:TTAGS)) . 1486104990))
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