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/usr/lib/x86_64-linux-gnu/lapack/zbak.in is in liblapack-test 3.7.1-4ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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ZBK:  Tests ZGEBAK
   5   1   1
  0.1000D+01  0.2000D+01  0.3000D+01  0.4000D+01  0.5000D+01

(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)

(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)

   5   1   1
  0.1000D+01  0.2000D+01  0.3000D+01  0.2000D+01  0.1000D+01

(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(-.66667D+00,0.00000D+00) (-.41667D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.25000D+00,0.00000D+00) (-.66667D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.16667D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.22222D+00,0.00000D+00)
(-.10000D+01,0.00000D+00) (-.50000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.50000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.10000D+01,0.00000D+00)

(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.50000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.22222D+00,0.00000D+00)
(-.10000D+01,0.00000D+00) (-.50000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.25000D+00,0.00000D+00) (-.66667D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.16667D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(-.66667D+00,0.00000D+00) (-.41667D-01,0.00000D+00)

   5   1   1
  0.1000D+01  0.2000D+01  0.3000D+01  0.2000D+01  0.1000D+01

(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.60000D-17,0.00000D+00) (-.60000D-17,0.00000D+00)
(-.60000D-17,0.00000D+00) (-.60000D-17,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.36000D-34,0.00000D+00)
(0.36000D-34,0.00000D+00) (0.36000D-34,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)

(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.36000D-34,0.00000D+00)
(0.36000D-34,0.00000D+00) (0.36000D-34,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.60000D-17,0.00000D+00) (-.60000D-17,0.00000D+00)
(-.60000D-17,0.00000D+00) (-.60000D-17,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)

   6   4   6
  0.4000D+01  0.3000D+01  0.5000D+01  0.1000D+03  0.1000D+00  0.1000D+01

(0.10000D+01,0.00000D+00) (0.13356D-05,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.30007D-10,0.00000D+00) (-.32523D-04,0.00000D+00) (0.13050D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (-.83300D-02,0.00000D+00)
(0.89289D-09,0.00000D+00) (-.67123D-04,0.00000D+00) (0.66874D-04,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.44554D-05,0.00000D+00) (-.33550D-02,0.00000D+00) (0.33448D-02,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.44554D-06,0.00000D+00) (-.33561D-01,0.00000D+00) (0.33437D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.44113D-09,0.00000D+00) (0.10115D+00,0.00000D+00) (0.10084D+00,0.00000D+00)

(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.44554D-03,0.00000D+00) (-.33550D+00,0.00000D+00) (0.33448D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.44554D-07,0.00000D+00) (-.33561D-02,0.00000D+00) (0.33437D-02,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.30007D-10,0.00000D+00) (-.32523D-04,0.00000D+00) (0.13050D-01,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.13356D-05,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (-.83300D-02,0.00000D+00)
(0.89289D-09,0.00000D+00) (-.67123D-04,0.00000D+00) (0.66874D-04,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.44113D-09,0.00000D+00) (0.10115D+00,0.00000D+00) (0.10084D+00,0.00000D+00)

   5   1   5
  0.1000D+03  0.1000D+00  0.1000D-01  0.1000D+01  0.1000D+02

(0.13663D-03,0.00000D+00) (-.68290D-04,0.00000D+00) (0.12516D-03,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.19503D-14,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (-.27756D-16,0.00000D+00)
(0.36012D-05,0.00000D+00) (-.60728D-17,0.00000D+00)
(0.27355D+00,0.00000D+00) (-.13627D+00,0.00000D+00) (0.25030D+00,0.00000D+00)
(-.33221D-05,0.00000D+00) (-.20000D-02,0.00000D+00)
(0.69088D-02,0.00000D+00) (-.34434D-02,0.00000D+00) (0.61959D-02,0.00000D+00)
(0.16661D-01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.38988D+00,0.00000D+00) (-.20327D+00,0.00000D+00) (-.34200D+00,0.00000D+00)
(-.10000D-02,0.00000D+00) (0.60004D-14,0.00000D+00)

(0.13663D-01,0.00000D+00) (-.68290D-02,0.00000D+00) (0.12516D-01,0.00000D+00)
(0.10000D+03,0.00000D+00) (0.19503D-12,0.00000D+00)
(0.10000D+00,0.00000D+00) (0.10000D+00,0.00000D+00) (-.27756D-17,0.00000D+00)
(0.36012D-06,0.00000D+00) (-.60728D-18,0.00000D+00)
(0.27355D-02,0.00000D+00) (-.13627D-02,0.00000D+00) (0.25030D-02,0.00000D+00)
(-.33221D-07,0.00000D+00) (-.20000D-04,0.00000D+00)
(0.69088D-02,0.00000D+00) (-.34434D-02,0.00000D+00) (0.61959D-02,0.00000D+00)
(0.16661D-01,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.38988D+01,0.00000D+00) (-.20327D+01,0.00000D+00) (-.34200D+01,0.00000D+00)
(-.10000D-01,0.00000D+00) (0.60004D-13,0.00000D+00)

   6   2   5
  0.3000D+01  0.1000D+01  0.1000D+01  0.1000D+01  0.1000D+01  0.4000D+01

(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.27764D-15,0.00000D+00)
(-.24046D-16,0.00000D+00) (0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.85197D-01,0.00000D+00) (0.00000D+00,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.80934D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.95328D-01,0.00000D+00)
(-.54260D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.95328D-01,0.00000D+00)
(-.54260D+00,0.00000D+00) (-.10000D+01,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.45588D-16,0.00000D+00)

(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.80934D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.00000D+00,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.85197D-01,0.00000D+00) (0.00000D+00,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.10000D+01,0.00000D+00) (0.27764D-15,0.00000D+00)
(-.24046D-16,0.00000D+00) (0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.45588D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.95328D-01,0.00000D+00)
(-.54260D+00,0.00000D+00) (-.10000D+01,0.00000D+00) (-.15196D-16,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.75000D+00,0.00000D+00) (-.95328D-01,0.00000D+00)
(-.54260D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (-.15196D-16,0.00000D+00)

   7   2   5
  0.3000D+01  0.1000D-02  0.1000D-01  0.1000D+02  0.1000D+00  0.1000D+01
  0.6000D+01

(0.10000D+01,0.00000D+00) (-.11048D-01,0.00000D+00) (0.37942D-01,0.00000D+00)
(-.93781D-01,0.00000D+00) (-.34815D-01,0.00000D+00) (0.44651D+00,0.00000D+00)
(-.36016D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.45564D+00,0.00000D+00) (-.45447D+00,0.00000D+00)
(0.10000D+01,0.00000D+00) (0.46394D+00,0.00000D+00) (-.65116D+00,0.00000D+00)
(0.47808D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.27336D+00,0.00000D+00) (-.79459D+00,0.00000D+00)
(0.63028D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (-.62791D+00,0.00000D+00)
(0.10000D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+01,0.00000D+00) (-.69389D-17,0.00000D+00)
(0.42585D-01,0.00000D+00) (-.64954D+00,0.00000D+00) (-.55814D+00,0.00000D+00)
(-.64516D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.39041D+00,0.00000D+00) (-.40294D+00,0.00000D+00)
(-.16849D+00,0.00000D+00) (-.94294D+00,0.00000D+00) (0.10000D+01,0.00000D+00)
(-.93714D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (-.25581D+00,0.00000D+00)
(0.33085D-03,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.19851D-02,0.00000D+00)

(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (-.25581D+00,0.00000D+00)
(0.33085D-03,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.45564D-03,0.00000D+00) (-.45447D-03,0.00000D+00)
(0.10000D-02,0.00000D+00) (0.46394D-03,0.00000D+00) (-.65116D-03,0.00000D+00)
(0.47808D-03,0.00000D+00)
(0.10000D+01,0.00000D+00) (-.11048D-01,0.00000D+00) (0.37942D-01,0.00000D+00)
(-.93781D-01,0.00000D+00) (-.34815D-01,0.00000D+00) (0.44651D+00,0.00000D+00)
(-.36016D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.10000D+02,0.00000D+00) (-.69389D-16,0.00000D+00)
(0.42585D+00,0.00000D+00) (-.64954D+01,0.00000D+00) (-.55814D+01,0.00000D+00)
(-.64516D+01,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.39041D-01,0.00000D+00) (-.40294D-01,0.00000D+00)
(-.16849D-01,0.00000D+00) (-.94294D-01,0.00000D+00) (0.10000D+00,0.00000D+00)
(-.93714D-01,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00) (0.00000D+00,0.00000D+00)
(-.19851D-02,0.00000D+00)
(0.00000D+00,0.00000D+00) (-.27336D-02,0.00000D+00) (-.79459D-02,0.00000D+00)
(0.63028D-02,0.00000D+00) (0.10000D-01,0.00000D+00) (-.62791D-02,0.00000D+00)
(0.10000D-01,0.00000D+00)

0 0 0