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my_var
=
10
x
=
123
echo $1
echo $USER
$
{
HOME
}
((
a
+
b
))
((
a
*
b
))
((
a
/
b
))
((
a
%
b
))
((
a
|
b
))
((
a
^
b
))
((
a
=
b
))
((
a
!
b
))
((
a
<
b
))
((
a
>
b
))
$
((
a
<
b
))
$
((
a
>
b
))
$
((
a
&
b
))
$
((
a
|
b
))
$
{
a
:
b
}
$
{
a
:
b
}
$
{
a
:
b
}
$
{
a
:
b
}
$
{
a
#*/}
$
{
a
%.*}
$
{
a
^}
$
{
a
,}
$
{
a
}
$
{
a
[*]}
ls
-
a
ls
--
all