SAMS Teach Yourself Perl in 24 Hours THIRD EDITION

Workshop

Quiz

1:	To open a file named data for writing, you should use which of the following: open(FH, "data", write); open(FH, "data"); and simply print to FH open(FH, ">data") || die "Cannot open data: $!";
2:	(-M $file > 1 and -s $file) is true if $file has been modified more than one day ago and has data. That expression cannot be true. $file is writeable and has no data.

Answers

A1:	c. Choice a is false because this is not how open opens a file for writing; b is false because it opens the filehandle only for reading. Choice c is true because it does what is asked—and uses good form by checking for errors.
A2:	a. –M returns the number of days old a file is (>1 is more than 1 day), and –s returns true if the file has data in it.

Activities

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