scanLines -- apply a function to each line of a file

Usage:

scanLines(f,fn)
Inputs:
- f
- fn, the name of a file, or a list of names of files
Outputs:
- returns null unless the function uses break x with a non-null value for x, in which case scanning stops and x is returned immediately
Consequences:
- applies f to each line of the file(s)

Description

The file is read and processed one block at a time, making this procedure potentially much better at conserving memory than scan(lines get fn,f) when the file is very large.

Ways to use scanLines:

scanLines(Function,List)
scanLines(Function,String)

For the programmer

The object scanLines is a method function.

The source of this document is in Macaulay2Doc/ov_system.m2:359:0.