?
Solved

split into an array?, ksh, awk version

Posted on 2006-07-03
12
Medium Priority
?
3,537 Views
Last Modified: 2013-12-26
How do you split a ksh shell variable into an array with awk?  

Perl version would be
@a = split /:/, $ENV{'PATH'}.

Thanks
0
Comment
Question by:hank1
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
  • 3
12 Comments
 
LVL 15

Expert Comment

by:bpmurray
ID: 17032037
This should do it:

{
      path = ENVIRON["PATH"];
      cnt = split(path, dir, ":");

      for (i=0; i<cnt; i++)
            print dir[i];
}
0
 
LVL 1

Author Comment

by:hank1
ID: 17032222
I know this is wrong, but I want the array outside of awk.  Is the awk
struct even close?  :-)
Thanks  (I couldn't get your script to run since I don't know, really
don't know, awk.  I guessed at an invoke of just awk .... no.)



awk {
   path = ENVIRON["PATH"];
   cnt = split(path, dir, ":");
}

while [ ${cnt[index]} ] ; do
  echo Here's the element ${cnt[index]}
  index=$((index + 1))
}
0
 
LVL 1

Author Comment

by:hank1
ID: 17032311
Here's something I found, but it uses a file.  Tried your ENVIRON["PATH"] but didn't
go.  Wanted a file



Fiddling with IFS should have helped, though you also want to
double-quote the @ expansion in the for loop's control section:
  oIFS=$IFS
  IFS=${IFS#??}
  set -A array $(awk -F: '{print $3}' go.dat)
  IFS=$oIFS
  for job in "${array[@]}"; do
     echo "$job"
  done

0
Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

 
LVL 15

Expert Comment

by:bpmurray
ID: 17032339
It really depends on what you want to do with the array. Do you simply want to populate a shell array with the contents of PATH? In any case, to run awk the usual way is: awk -f scriptfile [datafile]
0
 
LVL 15

Expert Comment

by:bpmurray
ID: 17033021
I think it's easier to do it in the shell directly. From your use of set -A, I presume you're using ksh, so you can use:

#!/bin/ksh
# Set directory names into "dirs", but set spaces to "+" first
set -A dirs `echo $PATH | tr " " "+" | tr ":" " "`
i=0
while [ ! -z "${dirs[$i]}" ]
do
        # change the "+" to spaces
      dir=`echo ${dirs[$i]} | tr "+" " "`
      echo $dir
      i=`expr $i + 1`
done
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 17033529
what's wrong with:
   set -A dirs `echo "$PATH"|tr ':' ' '`
# assuming that there is space in the path anywhere, which is unusal in Unix anyway
0
 
LVL 15

Expert Comment

by:bpmurray
ID: 17033549
There are spaces in the path - that's the problem. As you've noted, it's easy with no spaces :-)
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 17033574
hmm, who said that there are spaces?
0
 
LVL 15

Expert Comment

by:bpmurray
ID: 17033621
0
 
LVL 51

Accepted Solution

by:
ahoffmann earned 500 total points
ID: 17035733
ok, then we need to do it in 2 steps as you suggested, tr only can't do it, but awk

   set -A dirs `echo "$PATH"|awk -F: '{for(i=1;i<=NF;i++){printf" '"'"'%s'"'"'",$i}}'`

# ugly, but you asked for it ;-)
0
 
LVL 1

Author Comment

by:hank1
ID: 17054704
Yep, works like a champ.  I'll have to dip into this awk some day.  Thanks.
0
 
LVL 1

Author Comment

by:hank1
ID: 17057739
strings windup with enclosed with 's.  
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone 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

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
In this article, I'll describe -- and show pictures of -- some of the significant additions that have been made available to programmers in the MFC Feature Pack for Visual C++ 2008.  These same feature are in the MFC libraries that come with Visual …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Suggested Courses
Course of the Month8 days, 21 hours left to enroll

764 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