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.
The industry wide estimates of how long different roofing materials last are given below: 1  Asphalt Roofing shingles last 15 to 20 years. 2  Concrete or clay tiles typically last at least 20 years. 3  Wood shingles are good for 10 to 40 years.  Metal Roofing shingles or panels last 15 to 40 1  years. Slate lasts for 30 to 100 years.