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Aux

Aux is an abbreviation of auxiliary, used in computing and technology to denote something that supports a primary function, such as auxiliary data, devices, or inputs. The exact meaning is contextual; common uses include auxiliary files, auxiliary power, and auxiliary input or output.

In TeX and LaTeX, the file with the .aux extension is an auxiliary file created during compilation.

In DOS and Windows systems, AUX is a reserved device name that refers to the system console

As a prefix, aux- appears in many terms to denote supplementary components such as auxiliary power, auxiliary

It
stores
cross-reference
information
such
as
labels,
page
numbers
for
references,
and
entries
for
the
table
of
contents,
list
of
figures,
and
lists
of
tables.
The
.aux
file
is
read
by
subsequent
runs
to
resolve
references
and
to
help
BibTeX
or
biber
generate
bibliographies.
It
is
a
plain
text
file
named
after
the
main
document
(for
example,
mydocument.aux)
and
is
typically
located
in
the
same
directory
as
the
source.
Deleting
the
file
forces
a
full
re-run,
which
can
temporarily
delay
reference
resolution
until
new
data
is
written.
for
input
and
output.
It
belongs
to
a
set
of
reserved
names
such
as
CON,
NUL,
PRN,
and
cannot
be
used
for
regular
file
names
in
many
contexts.
Input
or
output
redirection
to
AUX
interacts
with
the
console
rather
than
a
file
on
disk.
input,
or
auxiliary
verb
in
linguistics.
The
term
is
also
used
in
various
technical
domains
to
label
secondary
or
supporting
systems
and
data.