Splitting string separated by comma into array values in shell script?

Question

My data set(data.txt) looks like this [imageID,sessionID,height1,height2,x,y,crop]:

1,0c66824bfbba50ee715658c4e1aeacf6fda7e7ff,1296,4234,194,1536,0
2,0c66824bfbba50ee715658c4e1aeacf6fda7e7ff,1296,4234,194,1536,0
3,0c66824bfbba50ee715658c4e1aeacf6fda7e7ff,1296,4234,194,1536,0
4,0c66824bfbba50ee715658c4e1aeacf6fda7e7ff,1296,4234,194,1536,950

These are a set of values which I wish to use. I'm new to shell script :) I read the file line by line like this ,

cat $FILENAME | while read LINE
do
string=($LINE)
# PROCESSING THE STRING
done

Now, in the code above, after getting the string, I wish to do the following : 1. Split the string into comma separated values. 2. Store these variables into arrays like imageID[],sessionID[].

I need to access these values for doing image processing using imagemagick. However, I'm not able to perform the above steps correctly

anubhava · Accepted Answer · 2014-06-25 14:58:56Z

6

set -A doesn't work for me (probably due to older BASH on OSX)

Posting an alternate solution using read -a in case someone needs it:

# init all your individual arrays here
imageId=(); sessionId=();

while IFS=, read -ra arr; do
    imageId+=(${arr[0]})
    sessionId+=(${arr[1]})
done < input.csv

# Print your arrays
echo "${imageId[@]}"
echo "${sessionId[@]}"

edited Jun 25, 2014 at 14:58

answered Jun 25, 2014 at 14:44

anubhava

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3 Comments

anirudh_raja Over a year ago

Neat solution covering most of my requirements ! Thanks a lot !

ooga Over a year ago

Couldn't you make the loop head while IFS=, read -ra arr; do, and get rid of the next line?

ooga Over a year ago

It seems that the initialization line imageId=(); sessionId=(); is not necessary either. (Although it couldn't hurt!)

Satya · Accepted Answer · 2014-06-25 14:33:46Z

1

oIFS="$IFS"; IFS=',' 
set -A str $string
IFS="$oIFS"

echo "${str[0]}";
echo "${str[1]}";
echo "${str[2]}";

you can split and store like this

have a look here for more on Unix arrays.

edited Jun 25, 2014 at 14:33

answered Jun 25, 2014 at 14:27

Satya

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2 Comments

anirudh_raja Over a year ago

Ok, so your splitting the string and storing them in an array. How do I store the entities in different arrays . I want to create arrays of imageID's , sessionID's etc. Can you please modify your code ?

ooga Over a year ago

set -A doesn't work for me (no -A option to set). The page you link to uses declare.

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