Slate industry in Spain Slate industry in Spain 90% of Europes's natural slate used for roofing originates from the slate industry in Spain, with the region of Galicia being the primary source of production. Slate is a fine-grained metamorphic rock that splits into thin, smooth-surfaced layers. Metamorphic rock is rock which was once igneous or sedimentary and has been subsequently subjected to heat and pressure in varying degrees thereby altering its composition, structure and appearance. It is used extensively in the building industry, particularly for roofing tiles. The production of slate is estimated at 4 million tons per year. Galicia is situated on the
Sort (Unix) name the output file because it was used to sort a file in place. In Version 5, Thompson invented "-" to represent standard input. $ cat "phonebook" The codice_1 option makes the program sort according to numerical value. The command produces output that starts with a number, the file size, so its output can be piped to to produce a list of files sorted by (ascending) file size: Use the codice_2 option to sort on a certain column. For example, use "codice_3" to sort on the second column). In old versions of sort, the codice_4 option made the program sort