This file is indexed.

/usr/lib/lapack/cbak.in is in liblapack-test 3.6.0-2ubuntu2.

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

The actual contents of the file can be viewed below.

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CBK:  Tests CGEBAK
   5   1   1
  0.1000E+01  0.2000E+01  0.3000E+01  0.4000E+01  0.5000E+01

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

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

   5   1   1
  0.1000E+01  0.2000E+01  0.3000E+01  0.2000E+01  0.1000E+01

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

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

   5   1   1
  0.1000E+01  0.2000E+01  0.3000E+01  0.2000E+01  0.1000E+01

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

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

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

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

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

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

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

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

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

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

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

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

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

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

0 0 0