# Set the initial value.
myvar=abc

echo "Test 1 ======"
echo $myvar        # abc
echo ${myvar}      # same as above, abc
echo {$myvar}      # {abc}

echo "Test 2 ======"
echo myvar         # Just the text myvar
echo "myvar"       # Just the text myvar
echo "$myvar"      # abc
echo "\$myvar"     # $myvar

echo "Test 3 ======"
echo $myvardef     # Empty line
echo ${myvar}def   # abcdef

echo "Test 4 ======"
echo $myvar$myvar      # abcabc
echo ${myvar}${myvar}  # abcabc

echo "Test 5 ======"
# Reset variable value, with spaces
myvar="a    b    c"    
echo "$myvar"          # a    b    c
echo $myvar            # a b c