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SYNOPSIS
string read_file(string file, int start, int number)
DESCRIPTION
Reads lines from file.
If <start> is not given or 0, the file is read from the
beginning, else the efun starts reading at the beginning of line
<start>.
If <number> is not given or 0, the whole file is read, else
just the given amount of lines.
If <start> would be outside the actual size of the file, 0 is
returned instead of a string.
The maximum bytes (not lines!) being read per call is LIMIT_FILE (see
query_limits()).
SEE ALSO
read_bytes(E), write_file(E)