linenumber 1 user commands nosh linenumbernumber lines linenumber filename(s) linenumber outputs either the contents of filename(s) or, if none are supplied, its standard input; to its standard output. The only processing that it does is to add an incrementing line number to the beginning of every line. Compare the -n option to cat1. linenumber was first proposed in a 1983 paper Program design in the UNIX environment by Rob Pike and Brian W. Kernighan. Unlike vis1 from the same paper, it was never written. cat1 vis1 sqz1 nl1 Jonathan de Boyne Pollard