shell script to read property in an array from property file

Question

conf.properties file have contents like this:

src1=abc
dest1=xyz

src2=123
dest2=456

...

The below shell script is accessing the src and dest properties from conf.properties file.

. /tmp/conf.properties

echo "$src1"
echo "$dest1"

echo "$src2"
echo "$dest2"

Now, there could be any number of src and dest properties in the file.

How to write a code to read all the src and dest from the property file into an array.

Answer 1

You can read and put them separately in two variables. Read the file line by line keep on appending the src thing in srcVal , seperated by space.

set -A srcArrVar -- $srcVal set -A destArrVar -- $destVal Or you can use associate arry like below

typeset -A srcArray
srcArray[src1]="abc"
srcArray[dest1]="xyz"

Yes you will need to parse the it .. I can immediately think of one way as below

grep "src" filename > srcFile
grep "dest" filename > destFile
sort srcFile > sortedSrcFile
sort destFile > sorteddestFile
srcVal=`cut -d"=" -f2 sortedSrcFile`
destVal=`cut -d"=" -f2 sorteddestFile`
set -A srcArrVar -- $srcVal
set -A destArrVar -- $destVal

There can be more elegant way of doing above thing by using sed/awk... and I have assumed that you have no missing values the series is continuous src1,src2... similarly dest1,dest2,dest3....

Answer 2

Created my own logic after getting clue from Ajay's Answer:

filename=/tmp/conf.properties

srcArr=($(grep "src" $filename)) 
destArr=($(grep "dest" $filename))

len=${#srcArr[@]}

for (( i=0; i<${len}; i++ ))
do
    srcVal=$(cut -d"=" -f2 <<< ${srcArr[i]})
    destVal=$(cut -d"=" -f2 <<< ${destArr[i]})

...

done