IF-Operator ======
<code bash>
#!/bin/bash
X=""
if [ -n "$X" ]; then # -n tests to see if the argument is non empty
echo "the varia... but its likely to be all you'll need to remember (if you need anything else, you can always check the bash manpage ... )
operator
produces true if...
number of operands
-n
operand non zero lengt... erators and numeric comparison operators as well. If the file argument to one of the primaries is of t
