/usr/share/doc/r-cran-tibble/tests/testthat/output/trunc_mat/long-5-30.txt is in r-cran-tibble 1.4.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # A tibble: 10,000 x 1
<body created by pillar>
# ... with 9,995 more rows
|