<s>
It	O
is	O
available	O
in	O
Unix	B-Application
operating	I-Application
systems	I-Application
and	O
many	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
The	O
command	B-Application
is	O
available	O
as	O
a	O
separate	O
package	O
for	O
Microsoft	B-Application
Windows	I-Application
as	O
part	O
of	O
the	O
UnxUtils	B-Application
collection	O
of	O
native	B-Language
Win32	B-Library
ports	O
of	O
common	O
GNU	B-Operating_System
Unix-like	B-Operating_System
utilities	O
.	O
</s>
<s>
Here	O
the	O
echo	B-Application
command	I-Application
prints	O
a	O
string	O
of	O
text	O
that	O
includes	O
a	O
tab	O
character	O
,	O
then	O
the	O
output	O
is	O
directed	O
into	O
the	O
expand	O
command	B-Application
.	O
</s>
<s>
The	O
resulting	O
output	O
is	O
then	O
displayed	O
in	O
hexadecimal	O
and	O
as	O
characters	O
by	O
the	O
xxd	O
dump	O
command	B-Application
.	O
</s>
<s>
At	O
the	O
second	O
prompt	O
,	O
the	O
same	O
echo	B-Application
output	O
is	O
sent	O
directly	O
to	O
the	O
xxd	O
command	B-Application
.	O
</s>
<s>
As	O
can	O
be	O
seen	O
by	O
comparing	O
the	O
two	O
,	O
the	O
expand	O
program	O
converts	O
the	O
tab	O
(	O
specified	O
as	O
'	O
\t	O
 '	O
to	O
the	O
echo	B-Application
program	O
)	O
into	O
spaces	O
.	O
</s>
