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.
Typically, a wood shingle roof will last 20 to 40 years. Natural slate is a roofing material that consists of shingle-like slivers of rock. The quality of the rock, its thickness, and density, all affect life expectancy. A slate roof can last from 45 to several hundred years.