Linux Pocket Guide

Errata for Linux Pocket Guide

Submit your own errata for this product.

The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted By Date submitted Date corrected
Page 105
Last paragraph, starting with -w N

I believe that the command name "sort" in last sentence, "If used with -s or -f, sort will ignore...", should be replaced by "uniq", since it is talking about the -w option of the uniq command. It does not make sense to talk about the behavior of "sort" here, since -s and -f options have different meanings for sort and are not related to skipping a number of characters or fields.

Note from the Author or Editor:
(Note: in my book, this is page 107, not 105.) The submitter is correct. Under "Useful Options," the final option, "-w N", the second sentence currently reads:

If used with -s or -f, sort will ignore[...]

The word "sort" should be changed to "uniq" so it reads:

If used with -s or -f, uniq will ignore[...]

Haofei  Dec 19, 2021 
Page 118
last paragraph

About md5sum, it states that " produces the 32-byte checksum..."

It should be a 16-byte checksum.

According to the md5sum man page and RFC 1321, MD5 outputs a 128-bit checksum. Making it 16 not 32 bytes, which is then displayed using 32 hexadecimal characters.

Note from the Author or Editor:
On page 118, in the section "md5sum", the second sentence contains the phrase "32-byte checksum". Change it to "32-digit checksum".

Jacob Petrie  Sep 09, 2022 
Page 121
First line under section "ps2ascii"

The first line under the section "ps2ascii",

ps2ascii file.(ps|pdf)] [outfile.txt]

has an unmatched close square bracket. Is the open bracket missing (meaning the argument file.(ps|pdf) is optional) or is the close bracket redundant (file.(ps|pdf) is mandatory)?

Note from the Author or Editor:
(Note: in my copy, this error is on page 124.) The error report is correct. In the line indicated by the reporter, the stray right-square-bracket should be removed so the line reads:

ps2ascii file.(ps|pdf) [outfile.txt]

Haofei  Dec 21, 2021 
Page 127
Heading of section "spell"

The heading for section "spell" shows "stdin stdout -file --opt --" in black, followed by "help --version" in gray.

1. As with all other headings, there should be a space between "-" and "file" as well as between "--" and "opt", which are currently missing.

2. "--help" is confusingly printed half black (for the dashes) and half gray (for the word).

Note from the Author or Editor:
(Note: In my copy, the error is on page 130, not 127.) The error report is correct. In the heading for the "spell" section, three changes need to be made. (1) Place a space between "-" and "file"; (2) place a space between "--" and "opt"; (3) In "--help", the initial "--" should be in grey, not black.

Haofei  Dec 21, 2021 
Page 151
1st paragraph

regarding the 'at' command, it says:

"offsets are a plus or minus sign followed by whitespace and an amount of time: + 3 seconds,"

i couldn't get this to work so i checked online and apparantly at does not support seconds as a time increment

Note from the Author or Editor:
[Note: In the printed edition, the error is on the last line of page 154, not page 151.]

Change "+ 3 seconds" to "+ 3 days".

dleghthikos  Mar 01, 2017  May 26, 2017