topic Re: using awk with open in Operating System - HP-UX

using awk with open

Ed Rantanen — Tue, 25 Nov 2008 18:30:29 GMT

I am new to perl so this might sound simple.

Here is a little script I have been working on, from a flat file I can get it to work but not from a pipe. print comes out as it should, but I am not sure why it dose not work for the while.
Any help would be appreciated.

#open(INFO, "iscan.txt");
open(INFO, "ioscan -fnCdisk |awk '\$1==\"disk\" {getline dev; print \$0, dev }|");

# print ;

$search = "CX3";
while ( ) {
if (( /$search/ ) && ( s/^.* $search-[234]0cWDR5 (.*) (.*)$/$2/ )) {
print;
}
}

Re: using awk with open

James R. Ferguson — Tue, 25 Nov 2008 18:43:28 GMT

Hi:

You want a piped open:

#!/usr/bin/perl
open(INFO, '-|', 'ioscan -fnCdisk' ) or die "Open error: $!\n";

$search = "CX3";
while ( ) {
if (( /$search/ ) && ( s/^.* $search-[234]0cWDR5 (.*) (.*)$/$2/ )) {
print;
}
}

Regards!

...JRF...

Re: using awk with open

Rita C Workman — Tue, 25 Nov 2008 18:54:13 GMT

I am not a programmer...but...
your print command seems to be out of place.

Here's a piece of one of my old ones.

awk 'BEGIN {
while ( "cat '$files' " | getline ) {
entries++
if ( $1 ~ "" ) print $1 }
}

The print is before the }.
Rita

Re: using awk with open

Ed Rantanen — Tue, 25 Nov 2008 19:02:00 GMT

I should have clarified better, when I do an ioscan the lines have to be rejoined before use.
If I run the command
ioscan -fnCdisk | awk '$1=="disk" {getline dev; print $0, dev }â > iscan.txt
the lines are joined. I was hoping to put the complete statement into the open(), and then use INFO with the while. I am trying to script out this process.

Insf -e
Ioscan -fnCdisk
Pvcreate /dev/rdsk/c#t#d#
Lvextend
Lvcreate
Newfs

Re: using awk with open

James R. Ferguson — Tue, 25 Nov 2008 19:13:36 GMT

Hi (again) Ed:

> I should have clarified better, when I do an ioscan the lines have to be rejoined before use.

OK, but you *still* don't want to mix 'awk' into Perl --- there's no need :-)

#!/usr/bin/perl
use strict;
use warnings;
my $line = '';
my $search = 'CX3';

open(INFO, '-|', 'ioscan -fnCdisk' ) or die "Open error: $!\n";

while ( ) {
next if m{^(Class|===)};
chomp;
if ( m{^disk} ) {
$line = $_;
next;
}
$_ = $line . $_;
print "$_\n";
if (( /$search/ ) && ( s/^.* $search-[234]0cWDR5 (.*) (.*)$/$2/ )) {
print;
}
}

Regards!

...JRF...

Re: using awk with open

Ed Rantanen — Tue, 25 Nov 2008 19:33:14 GMT

Thanks for the help!

Made quick mod to the prints and it works great now. The hard part will be understanding the new junks of code.

Re: using awk with open

James R. Ferguson — Tue, 25 Nov 2008 19:37:15 GMT

Hi (again) Ed:

Since you are a new member, I'll ask you to please look at this, too:

http://forums11.itrc.hp.com/service/forums/helptips.do?#28

Welcome and Regards!

...JRF...

Re: using awk with open

Ed Rantanen — Tue, 25 Nov 2008 19:40:26 GMT

Thanks for the help problem solved.

Re: using awk with open

Dennis Handly — Tue, 25 Nov 2008 19:43:30 GMT

>awk '$1=="disk" {getline dev; print $0, dev }' > iscan.txt
>the lines are joined.

Yes, it should do that. Alternately you can use printf then print:
{ printf "%s", $0; getline; print $0 }