July 2005
Intermediate to advanced
944 pages
158h 24m
English
book
Linux in a Nutshell, Fifth Edition
by Ellen Siever, Aaron Weber, Stephen Figgins, Robert Love, Arnold Robbins
Content preview from Linux in a Nutshell, Fifth Edition
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Chapter 11: The gawk Programming Language
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
Coprocesses and Sockets
gawk allows you to open a two-way pipe to another process, called a coprocess.
This is done with the |& operator used with getline and print or printf.
print database command |& "db_server"
"db_server" |& getline response
If the command used with |& is a filename beginning with /inet/, gawk opens a
TCP/IP connection. The filename should be of the following form:
/inet/protocol/lport/hostname/rport
The parts of the filename are:
protocol
One of tcp, udp or raw, for TCP, UDP, or raw IP sockets, respectively. Note:
raw is currently reserved but unsupported.
lport
The local TCP or UPD port number to use. Use 0 to let the operating system
pick a port.
hostname
The name or IP address of the remote host to connect to.
rport
The port (application) on the remote host to connect to. A service name (e.g.,
tftp) is looked up using the C getservbyname( ) function.
Profiling
When gawk is built and installed, a separate program named pgawk (profiling
gawk) is built and installed with it. The two programs behave identically;
however, pgawk runs more slowly because it keeps execution counts for each
statement as it runs. When it is done, it automatically places an execution profile
of your program in a file named awkprof.out. (You can change ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.