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shell

Shell is a term that may refer to several concepts across science, technology, and industry. It commonly denotes a computing command-line interface, a model of atomic and nuclear structure, a hard protective covering produced by living organisms, and the multinational energy company Shell plc.

In computing, a shell is a user interface that enables interaction with an operating system. It interprets

In chemistry and physics, electron shells are principal energy levels around an atomic nucleus in which electrons

In biology, shells are hard external coverings produced by many mollusks and some turtles and crustaceans.

Shell plc, commonly referred to as Shell, is a British multinational energy company and one of the

commands,
provides
scripting
capabilities,
and
connects
programs
through
pipes
and
redirection.
Popular
examples
include
Bash
and
Zsh
on
Unix-like
systems
and
PowerShell
on
Windows,
with
many
other
variants
for
different
environments.
reside.
Shells
are
filled
in
a
defined
order
and
are
central
to
models
of
atomic
structure;
in
the
nuclear
shell
model,
protons
and
neutrons
occupy
energy
levels
within
the
nucleus.
They
vary
in
composition,
shape,
and
structure,
from
calcium
carbonate
to
conchiolin,
and
range
from
spiraled
to
bivalved
forms.
They
provide
protection,
support,
and,
in
some
cases,
buoyancy.
largest
oil
and
gas
firms.
Formed
by
the
1907
merger
of
Royal
Dutch
Petroleum
and
the
Shell
Transport
and
Trading
Company,
it
operates
in
exploration,
refining,
distribution,
and
energy
transition
initiatives.