Editing Line printer (section)

== Influence on hardware and software ==
The names of the <code>[[lp (Unix)|lp]]</code> and <code>[[Line Printer Daemon protocol|lpr]]</code> commands in [[Unix]] were derived from the term "line printer". Analogously, many other systems call their printing devices "LP", "LPT", or some similar variant, whether these devices are in fact line printers or other types of printers. These references served to distinguish formatted final output from normal interactive output from the system, which in many cases in line printer days was also printed on paper (as by a [[teleprinter#Teleprinters in computing|teletype]]) but not by a line printer. Line printers printed characters, letters and numbers line by line. The [[Parallel port|parallel ports]] of computers so equipped were usually designated LPTx, for line printer.