6.
The other operator (${#array[*]}) has to do with array variables.
==== String Length ====
<code>
... index $string $substring
</code>
Numerical position in $string of first character in $substring th... # C position.
echo `expr index "$stringZ" 1c` # 3
# 'c' (in #3 position) matches before '1'.</code>
This is the near e
f [ "$a" -le "$b" ]</code>
----
<
is less than (within double parentheses)
<code>(("$a" < "$b"))</code>
----
//<=//
is less than or equal to (within double parentheses)
<code>(("$a" <= "$b"))</code>
----
>
is greater than (within double parentheses)
<code>(("$a" > "$b"))</code>
----
//>=//
is greater than or equal to (within double parentheses)
<code>(("$a" >= "$b"))</c