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Top Forums Shell Programming and Scripting awk's getline < "-" seems not work for pipe Post 302305067 by qiulang on Tuesday 7th of April 2009 11:56:54 PM
Old 04-08-2009
awk's getline < "-" seems not work for pipe

Hi all,

I have an gawk script to get user's input, So I use

getline name < "-" (or getline name < "/dev/stdin") in my script

They both work fine when my script deals with files. But it is broken for pipes.
When I try "some command | my awk script", the variable name just gets an empty value (""), it does not get the value from stdin at all.

Why is that ? And how do I fix it ?

Last edited by qiulang; 04-08-2009 at 09:01 AM..
 

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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)
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