/usr/share/trimmomatic/TruSeq3-SE.fa is in trimmomatic 0.32+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | >TruSeq3_IndexedAdapter
AGATCGGAAGAGCACACGTCTGAACTCCAGTCAC
>TruSeq3_UniversalAdapter
AGATCGGAAGAGCGTCGTGTAGGGAAAGAGTGTA
|