Solved

Need to pull out fields using awk or similar

Posted on 2002-07-22
10
280 Views
Last Modified: 2010-04-21
From the following output, I need to pull out the field to the left of the "1" - e.g. 'hostnameb'. Is there a simple awk statement or similar that I can use to do this?

AnSG   SystemList    global   hostnamea 2 hostnameb 1

The field will not necessarily be second from the end - but always the first field to the left of the "1". Shortest way gets the points.
0
Comment
Question by:jonke
10 Comments
 
LVL 51

Accepted Solution

by:
ahoffmann earned 100 total points
ID: 7170433
echo "AnSG  SystemList  global hostnamea 2 hostnameb 1"|perl -pe 's#.*\s+([^\s]*)\s+1\s+.*#\1#'
0
 
LVL 1

Expert Comment

by:Techno__Mage
ID: 7171046
The following will work, but only if it is always the 6th item in the output :  

echo "AnSG   SystemList    global   hostnamea 2 hostnameb 1" | awk {'print $6'}
0
 
LVL 84

Expert Comment

by:ozo
ID: 7171055
echo "AnSG SystemList global hostnamea 2 hostnameb 1"|perl -pe 's#.*\b(\w+)\s+1\b.*#$1#'
0
Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

 
LVL 51

Expert Comment

by:ahoffmann
ID: 7171283
ozo is always a few characters shorter ;-)
Anyway, this solution fails (as mine does too) on some special patterns:
  AnSG SystemList global hostnamea 2 hostnameb 1x
I'm wondering 'cauase \b should do the trick
0
 
LVL 84

Expert Comment

by:ozo
ID: 7171314
What does jonke want to do with pattterns like 1x ?
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 7171359
> .. want to do with pattterns like 1x
don't know, but tread the question:

  The field will not necessarily be second from the end - but always the first field to the left of the "1"

and this example:

  foo bar global host1name 1 hostnameb 1x host 1 bla bla

jonke, could you please clarify
0
 
LVL 2

Author Comment

by:jonke
ID: 7171584

To clarify, I have  list of hosts and associated id's
upto a maximum of 32. They are not necessarily in order.

e.g. host1a 2 host4x 1 anotherhost 3

I need to pick out the primary host - which will be the hostname to the left of the standalone '1'. Can you see any potential probs using this across two different OS's? This script will be running on both Sun and HP machines.
0
 
LVL 6

Expert Comment

by:bira
ID: 7196494
set -A arr `echo "AnSG   SystemList    global   hostnamea 2 hostnameb 1"`
i=0
host=x
while [ "$host" <>  "" ] ;
do
host_before=$host
host=${arr[$i]}
       if [ $host = 1 ] ; then
               echo "Primary Host:" $host_before
          exit
       fi
i=`expr $i + 1`
done
0
 
LVL 20

Expert Comment

by:tfewster
ID: 8048910
No comment has been added lately, so it's time to clean up this Topic Area.
I will leave a recommendation for this question in the Cleanup topic area as follows:

- Answered by ahoffmann

Please leave any comments here within the next 7 days

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

tfewster
Cleanup Volunteer
0
 

Expert Comment

by:SpideyMod
ID: 8096451
per recommendation

SpideyMod
Community Support Moderator @Experts Exchange
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to Change Interface on Cisco IOU 11 110
aix tls version 6 417
dot directory in FreeBSD??? 4 87
Wrap Oraccle SQL*Plus executable Command 4 95
Hello fellow BSD lovers, I've created a patch process for patching openjdk6 for BSD (FreeBSD specifically), although I tried to keep all BSD versions in mind when creating my patch. Welcome to OpenJDK6 on BSD First let me start with a little …
A metadevice consists of one or more devices (slices). It can be expanded by adding slices. Then, it can be grown to fill a larger space while the file system is in use. However, not all UNIX file systems (UFS) can be expanded this way. The conca…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question