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Shell Programming and Scripting
awk's getline < "-" seems not work for pipe
Post 302305418 by qiulang on Wednesday 8th of April 2009 10:24:00 PM
04-08-2009
"exec 3>&0" seems to only work when typing at shell prompt
Well, typing "exec 3>&0" at shell prompt works as you said. But if you put it in shell script, it just doesn't work (I hit this problem before and never figure out why). So the codes as you suggest would be like,
#!/usr/bin/sh
exec 3>&0
awk 'BEGIN {printf "Enter your name:" ; getline name < "/dev/fd/3"}{ print name, $1 }' $1
BUT it does not work for pipe either!!
And as I said before I don't want to wrap my awk script inside a shell script (otherwise letting the shell script to ask for users' input would be much easier), so the awk script would be like following,
#!/usr/bin/gawk -f
BEGIN {
system("exec 3>&0")
printf "Enter your name:"
getline name < "/dev/fd/3"
}
{ print name, $3 }
And it even generates the error message like "fatal: can't stat fd 3 (Bad file number)"
#!/usr/bin/sh
exec 3>&0
awk 'BEGIN {printf "Enter your name:" ; getline name < "/dev/fd/3"}{ print name, $1 }' $1
BUT it does not work for pipe either!!
And as I said before I don't want to wrap my awk script inside a shell script (otherwise letting the shell script to ask for users' input would be much easier), so the awk script would be like following,
#!/usr/bin/gawk -f
BEGIN {
system("exec 3>&0")
printf "Enter your name:"
getline name < "/dev/fd/3"
}
{ print name, $3 }
And it even generates the error message like "fatal: can't stat fd 3 (Bad file number)"
Last edited by qiulang; 04-08-2009 at 11:32 PM..
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LEARN ABOUT CENTOS
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)