<s>
Pry	B-Application
is	O
an	O
interactive	B-Operating_System
shell	I-Operating_System
for	O
the	O
Ruby	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
is	O
notable	O
for	O
its	O
Smalltalk-inspired	O
ability	O
to	O
start	O
a	O
REPL	B-Application
within	O
a	O
running	O
program	O
.	O
</s>
<s>
This	O
lets	O
programmers	B-Application
debug	B-Device
and	O
modify	O
the	O
current	O
state	O
of	O
a	O
system	O
.	O
</s>
<s>
Pry	B-Application
exposes	O
most	O
of	O
its	O
introspective	O
capabilities	O
using	O
a	O
filesystem	B-Application
metaphor	O
.	O
</s>
<s>
For	O
example	O
,	O
it	O
has	O
a	O
cd	B-Application
command	O
to	O
start	O
interacting	O
with	O
a	O
particular	O
object	O
,	O
and	O
uses	O
ls	B-Application
to	O
list	O
methods	B-Language
and	O
variables	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
start	O
Pry	B-Application
at	O
any	O
point	O
inside	O
a	O
running	O
program	O
.	O
</s>
<s>
Due	O
to	O
the	O
reflective	B-Language
nature	O
of	O
Ruby	B-Language
,	O
this	O
lets	O
the	O
programmer	B-Application
inspect	O
the	O
program	O
,	O
change	O
its	O
current	O
state	O
,	O
or	O
correct	O
the	O
source	O
code	O
without	O
restarting	O
the	O
process	O
.	O
</s>
<s>
A	O
number	O
of	O
third	O
party	O
plugins	O
are	O
available	O
for	O
Pry	B-Application
,	O
these	O
add	O
tighter	O
integration	O
with	O
other	O
Ruby	B-Language
projects	O
,	O
enhance	O
the	O
abilities	O
of	O
Pry	B-Application
itself	O
,	O
and	O
make	O
Pry	B-Application
available	O
over	O
a	O
remote	O
connection	O
.	O
</s>
