Reading the properties file using shell script

[bubunia...@gmail.com]

Hi all,

I have a property file which has both list as well as key=value pair.

For example :

a.properties

A1=X1
B1=[Y1,Z1,W1]

I want to read each key value arguments and set it in my script.
For example test.sh to create a separate dynamic flat file based on the parsed key pair values.

Can I read the values as list for a key using shell script?

If so can anyone provide me an example for the same?

I tried it but was unsuccessful and it gives error: return: "X1": numeric argument required. This is due to to the fact that shell script can only accept numeric return code not string or list etc. How can I tackle this problem and any cool idea?


FILE_NAME="./a.properties"

function getProperty()
{
prop_key=$1
prop_value=`cat ${FILE_NAME} | grep ${prop_key} | cut -d'=' -f2`
return $prop_value

}

function readPropFile() {

local propFileName=$1

# Key in Property File
key="Name"

# Variable to hold the Property Value
prop_value=""


testA1=$(getProperty "A1")

echo "A:$testA1"

}



readPropFile $FILE_NAME

Regards
Pradeep

[Lew Pitcher]

bubunia...@gmail.com wrote:

> Hi all,
>
> I have a property file which has both list as well as key=value pair.
>
> For example :
>
> a.properties
>
> A1=X1
> B1=[Y1,Z1,W1]
>
> I want to read each key value arguments and set it in my script.
> For example test.sh to create a separate dynamic flat file based on the
> parsed key pair values.
>
> Can I read the values as list for a key using shell script?

Yes.

>
> If so can anyone provide me an example for the same?

15:07 $ cat ./a.properties
A1=X1
B1=[Y1,Z1,W1]

15:07 $ ./getproperty.sh A1
For KEY A1, VALUE is X1

15:07 $ ./getproperty.sh B1
For KEY B1, VALUE is [Y1,Z1,W1]

15:07 $ ./getproperty.sh C1
No VALUE for KEY C1

15:07 $ cat ./getproperty.sh
#!/bin/bash

function GetProperty()
{
cat "$1" |
while read LINE ;
do
IFS='=' KVPAIR=( ${LINE} )
if [ "$2" = "${KVPAIR[0]}" ]
then
echo "${KVPAIR[1]}"
fi
done
}

KEY=$1

VALUE=$(GetProperty "./a.properties" "${KEY}")

if [ -n "${VALUE}" ]
then
echo For KEY "${KEY}", VALUE is "${VALUE}"
else
echo No VALUE for KEY "${KEY}"
fi



HTH
--
Lew Pitcher
"In Skills, We Trust"
PGP public key available upon request

[bubunia...@gmail.com]

Thanks for the code. But I guess this will make the properties file will be read multiple times which may decrease performance. Can we get the properties content in an associate array without reading multiple times?

[Lew Pitcher]

bubunia...@gmail.com wrote:
[snip]

> Thanks for the code. But I guess this will make the properties file will
> be read multiple times which may decrease performance. Can we get the
> properties content in an associate array without reading multiple times?

Sure. You could build that from the example code I posted, but the simplest
way would be to "source" the properties file, then use the property key as a
shell variable

For example:

10:25 $ cat ./a.properties
A1=X1
B1=[Y1,Z1,W1]

10:25 $ echo $A1

10:25 $ echo $B1

10:25 $ echo $V1

10:25 $ source ./a.properties

10:26 $ echo $A1
X1

10:26 $ echo $B1
[Y1,Z1,W1]

10:26 $ echo $V1

10:26 $