August 2000
Intermediate to advanced
816 pages
29h 45m
English
book
Linux in a Nutshell, Third Edition
by Ellen Siever, Stephen Spainhour, Jessica P. Hekman, Stephen Figgins
Content preview from Linux in a Nutshell, Third Edition
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Metacharacters, Listed by Linux Program
Some metacharacters are valid for one program but not for another. Those that are available to a given program are marked by a bullet (•) in the following table. Notes are provided after the table, and full descriptions of metacharacters are in the following section.
| Symbol | ed | vi | sed | awk | grep | egrep | Action |
|---|---|---|---|---|---|---|---|
.
| • | • | • | • | • | • |
Match any character (can match newline in gawk). |
*
| • | • | • | • | • | • |
Match zero or more preceding. |
^
| • | • | • | • | • | • |
Match beginning of line or string. |
$
| • | • | • | • | • | • |
Match end of line or string. |
\
| • | • | • | • | • | • |
Escape character following. |
[]
| • | • | • | • | • | • |
Match one from a list or range. |
\(\)
| • | • | • |
Store pattern for later replay. | |||
\
n
| • | • | • |
Reuse matched text stored in | |||
{}
| • |
Match a range of instances. | |||||
\{\}
| • | • | • | • |
Match a range of instances. | ||
\<\>
| • |
Match word’s beginning or end. | |||||
+
| • | • | • |
Match one or more preceding. | |||
?
| • | • | • |
Match zero or one preceding. | |||
|
| • | • |
Separate choices to match. | ||||
()
| • | • |
Group expressions to match. |
On some Linux systems, grep is a link to egrep, so whenever you run grep you actually get egrep behavior.
In ed, vi, and sed, when you perform a search-and-replace (substitute) operation, the metacharacters ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.