awk doesn't understand 'read' statement!!! Post: 302796793

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Top Forums Shell Programming and Scripting awk doesn't understand 'read' statement!!! Post 302796793 by Don Cragun on Saturday 20th of April 2013 08:00:51 PM

04-20-2013

Registered User

Quote:

Originally Posted by hanson44

Yes, alister is right. "read" is very different from "break" and "continue".

Also, awk is very different from shell. One huge difference is that awk is not intended as an interactive environment.

There is no reason why awk can't be used interactively. If you don't specify any input file for your awk program, it will read from standard input. If you need your awk program to read initialization data from a file and then interact with a user by reading standard input after that, use the name of the initialization data file as the first file operand and - as the next file operand.

When I'm testing small awk programs to see why some expression isn't working the way I expected, I frequently type in a small awk program and then just type input into it see what happens (and end it with ctl-D).

It is true that the shell and awk languages are different, but awk certainly has multiple ways to read and write files. Look at the awk man page on your system and search for the descriptions of functions like close, getline, print, printf, and system.

And as several people have said, break and continue have nothing to do with reading a file; they are used inside while and for loops for flow control in those loops.

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LEARN ABOUT LINUX

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)