[SOLVED] Assigning Multiple Comma Separated IP's To A Bash Array

metallica1973 · 06-28-2012, 04:56 PM

I am in the process of creating a BASH shell scripts for a project at work. So the scenario is as such:

I have a file with each line entry separated by ':'

Code:

testaccount:D#%G%^V&:MeMyselfandI:memyselfandi@somesite.com:11/242012:192.168.1.1,192.168.1.2,192.168.1.3,192.168.1.4,192.168.1.5:$1360.

In parsing these strings, The only data that I need as of right now is only the row of ip address which is always the second to the last field of the line. I can successfully create my array using:

Code:

test_array=( $( cat wspasswd| awk -F ':' '/^testaccount/ {print $(NF-1)  }' ) )

which produces:

Code:

echo ${#test_array[@]}
192.168.1.1,192.168.1.2,192.168.1.3,192.168.1.4,192.168.1.5

which is exactly what I want except I noticed that it is putting all of the results in only "1" index

so:

Code:

echo ${#test_array[@]}
1
echo ${test_array[0]}
192.168.1.1,192.168.1.2,192.168.1.3,192.168.1.4,192.168.1.5

I need each one of these ip address to go into its own index, so for example:

Code:

echo ${#test_array[@]}
5
echo ${test_array[0]}
192.168.1.1
echo ${test_array[1]}
192.168.1.2
and so forth

What am I missing?

Nominal Animal · 06-28-2012, 05:17 PM

You forgot to convert the commas in the field into newlines in the awk script just prior to printing the field. So, add

Code:

gsub(/,+/, "\n", $(NF-1)) ;

into the awk command, just before the print part. I would personally use

Code:

gsub(/[\t\v\f ,]+/, "\n", $(NF-1)); printf("%s\n", $(NF-1))

to remind myself \n is explicitly used.

metallica1973 · 06-28-2012, 08:23 PM

thanks for the reply. I am angry at myself becaused I was using the

Code:

IFS=','

which will causes a split instead of a space before but totally forgot to use it during testing from the cli. Once I declared field separator all worked as planned.

Code:

echo ${#test_array[*]}
5

grail · 06-29-2012, 04:30 AM

Just a word of caution that when you (un)set IFS to be wary of undoing your change as it may affect other parts of your code in an unexpected fashion