For example, if you had a batch file called stuff.bat and you typed stuff a b c d at the command prompt, the letters a, b, c, and d would be assigned to the variables %1, %2, %3, and %4, respectively.
Fiberglass shingles generally have a longer life expectancy than do asphalt shingles. Properly installed tiled roofs have a normal useful life of 20-30 years or longer, but individual pieces can become cracked or broken or the nails rust out.
A shingle roof generally lasts twenty to fifty years. This covers a number of types of material including composition shingle, asphalt shingle, dimensional shingle, 3-tab shingle and more. Shingles come in four major varieties: 20, 30, 40 and 50-year. These are, as you can see, categorized by their life-expectancy.