Errata

In the Vim column the keystroke for "Move forward by one character" should be 'l', whereas "Move backward by one character" should be 'h'.

And lastly, regarding the actions about capitalization, there are some inaccuracies. 'Meta-c', 'Meta-u' and 'Meta-d' all alter the current word, instead of the next one. 'w~', though, does act on the next word, but "switches" the case. So "Capitalize first letter of next word" is true only if the character under the cursor is lowercase.

Note from the Author or Editor:
The submitter is correct. Will be updated in next printing of the book.

These paragraphs contain the phrases "except for a leading dot" and "except a leading dot." They should say "except for a leading dot or a directory slash."

The "ls" command to list duplicate directories has a misplaced left parenthesis. It should be at the start of the command (to the left of the FIRST "ls"), not to the left of the SECOND "ls".

The full command should be:

(ls -d */ && ls -d */*/ | cut -d/ -f2-) | sort | uniq -c | sort -nr | less

Change the last few words:

affect the parent.

to this:

affect the original (parent) shell.

Change the last three words of the paragraph, "and other programs," to be "and the programs it launches."

I'm not sure whether this is a problem.
But in the second solution, if "ls -1" is used before the command substitution, I might get some unexpected results under specific circumstances.

For example, if I have directory containing the following files and try to the find unmatched pairs of files:
aaa.txt aaa.jpg bbb.txt ccc.txt ccc.jpg
In this situation, ”bbb.txt“ will certainly be the result.
But if in the directory, I also have some files that start with the 'bbb' part, for instance, "bbbb.txt" and "bbbb.jpg”, these files will also be shown in the result.

Note from the Author or Editor:
The solution is missing a dot (period) character. To fix the problem, change the text in three locations.

(1) P. 145, second paragraph of text. Change the final sentence from this:

Stick an asterisk (a wildcard) onto the end of each line of output with awk:

to this:

Stick a dot and an asterisk onto the end of each line of output with awk"

(2) P. 145, second AND third code samples. In the fourth line of each code sample (the awk command), in the "print" action, add a dot before the asterisk. The code in both samples changes from this:

print $2 "*"

to this:

print $2 ".*"

(3) P. 145, second code sample, change the command output by adding dots before each asterisk. The output changes from this:

blue_jay*
oriole*
yellow.canary*

to this:

blue_jay.*
oriole.*
yellow.canary.*