Learning Perl, 2nd Edition
by Randal L. Schwartz and Tom Christiansen


Here are the changes made in the 10/99 reprint:


(18) Used to read:
	
	If you were running with -w, you would have to check that 
	the return value read in was actually defined. The empty 
	string returned by the <WORDLIST> operation isn't merely 
	empty: it's undef again. The defined function is how you 
	test for undef when this matters. When reading lines from 
	a file, you'd do the test this way:

	 	while ( defined ($name = <WORDLIST>) ) { 

Now reads:

	If you were running with -w, you would have to check that 
	the return value read in was actually defined. The empty 
	string returned by the <WORDSLIST> operation isn't merely 
	empty: it's undef again. The defined function is how you 
	test for undef when this matters. When reading lines from 
	a file, you'd do the test this way:

	
		while ( defined ($name = <WORDSLIST>) ) {


(39) Added footnote missing from 5/99 reprint. It now reads:

  
	Hex and octal values are not supported in this automatic 
	conversion. Use hex and oct to interpret hex and octal values.


(33) In the paragraph under Single-Quoted Strings, "single-quoted
     string" in the second-to-last sentence was changed to "double-quoted 
     string." But the examples following this sentence still show a 
     backslash within a single-quoted string, and the whole section is 
     about "Single-quoted strings". Changed it back.


{49.4.2} Used to read:
	
	(1.2 .. 5.2)      # same as (1.2, 2.2, 3.2, 4.2, 5.2)

Now reads:
	
	(1.2 .. 5.2)      # same as (1, 2, 3, 4, 5)

 
{49.6.1} Used to read:
	
	(1.3 .. 6.1)      #same as (1.3,2.3,3.3,4.3,5.3)

Now reads:
	
	(1.3 .. 6.1)      #same as (1, 2, 3, 4, 5, 6)


{85} The code was incorrectly changed in the 7/98 reprint to read 
     "l" (letter el) instead of "1" (number one). It has been changed to
     (letter L capitalized only to emphasize it):
	
	$a =~ /(.)\1/;      # also true (matches the double L)


{231} In the answer for Question 3,

	"for (sort by_last keys %last) {"

Now reads

	"foreach (sort by_last keys %last) {"