/usr/share/fish/completions/awk.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Command specific completions for the awk command.
# These completions where generated from the commands
# man page by the make_completions.py script, but may
# have been hand edited since.
#
complete -c awk -s F --description 'Define the input field separator to be the extended regular expression ERE, before any input is read; see Regular Expressions' -r
complete -c awk -s f --description 'Specify the pathname of the file progfile containing an awk program' -r
complete -c awk -s v --description 'The application shall ensure that the assignment argument is in the same form as an assignment operand' -r
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