Chapter 11. Practical awk Programs
Chapter 10, A Library of awk Functions,
presents the idea that reading programs in a language contributes to
learning that language. This chapter continues that theme, presenting a potpourri of
awk programs for your reading enjoyment.
There are three sections. The first describes how to
run the programs presented in this chapter.
The second presents
awk versions of
several common POSIX utilities. These are programs that you are hopefully
already familiar with, and therefore whose problems are understood. By
reimplementing these programs in
can focus on the
awk-related aspects of
solving the programming problems.
The third is a grab bag of interesting programs. These solve a number
of different data-manipulation and management problems. Many of the programs
are short, which emphasizes
to do a lot in just a few lines of code.
Many of these programs use library functions presented in Chapter 10.
Running the Example Programs
To run a given program, you would typically do something like this:
program is the name of the
awk program (such as
options are any command-line options for the
program that start with a ‘
-’, and the
files are the actual datafiles.
If your system supports the ‘
executable interpreter mechanism (see Executable awk Programs), you
can instead run your program directly:
cut.awk -c1-8 myfiles > results
awk is not
gawk, you may instead need to use this: