linux - How to read a .properties file which contains keys that have a period character using Shell script

Question

I am trying to read a properties file from a shell script which contains a period (.) character like below:

# app.properties
db.uat.user=saple user
db.uat.passwd=secret


#/bin/sh
function pause(){
   read -p "$*"
}

file="./app.properties"

if [ -f "$file" ]
then
    echo "$file found."
 . $file

echo "User Id " $db.uat.user
echo "user password =" $db.uat.passwd
else
    echo "$file not found."
fi

I have tried to parse the file after sourcing the file but it is not working since the keys contains the "." character and there are spaces in that value also.

My properties file always resides in the same directory of the script or somewhere in /usr/share/doc

Answer 1

I use simple grep inside function in bash script to receive properties from .properties file.

This properties file I use in two places - to setup dev environment and as application parameters.

I believe that grep may work slow in big loops but it solves my needs when I want to prepare dev environment.

Hope, someone will find this useful.

Example:

File: setup.sh

#!/bin/bash

ENV=${1:-dev}

function prop {
    grep "${1}" env/${ENV}.properties|cut -d'=' -f2
}

docker create 
    --name=myapp-storage 
    -p $(prop 'app.storage.address'):$(prop 'app.storage.port'):9000 
    -h $(prop 'app.storage.host') 
    -e STORAGE_ACCESS_KEY="$(prop 'app.storage.access-key')" 
    -e STORAGE_SECRET_KEY="$(prop 'app.storage.secret-key')" 
    -e STORAGE_BUCKET="$(prop 'app.storage.bucket')" 
    -v "$(prop 'app.data-path')/storage":/app/storage 
    myapp-storage:latest

docker create 
    --name=myapp-database 
    -p "$(prop 'app.database.address')":"$(prop 'app.database.port')":5432 
    -h "$(prop 'app.database.host')" 
    -e POSTGRES_USER="$(prop 'app.database.user')" 
    -e POSTGRES_PASSWORD="$(prop 'app.database.pass')" 
    -e POSTGRES_DB="$(prop 'app.database.main')" 
    -e PGDATA="/app/database" 
    -v "$(prop 'app.data-path')/database":/app/database 
    postgres:9.5

File: env/dev.properties

app.data-path=/apps/myapp/

#==========================================================
# Server properties
#==========================================================
app.server.address=127.0.0.70
app.server.host=dev.myapp.com
app.server.port=8080

#==========================================================
# Backend properties
#==========================================================
app.backend.address=127.0.0.70
app.backend.host=dev.myapp.com
app.backend.port=8081
app.backend.maximum.threads=5

#==========================================================
# Database properties
#==========================================================
app.database.address=127.0.0.70
app.database.host=database.myapp.com
app.database.port=5432
app.database.user=dev-user-name
app.database.pass=dev-password
app.database.main=dev-database

#==========================================================
# Storage properties
#==========================================================
app.storage.address=127.0.0.70
app.storage.host=storage.myapp.com
app.storage.port=4569
app.storage.endpoint=http://storage.myapp.com:4569
app.storage.access-key=dev-access-key
app.storage.secret-key=dev-secret-key
app.storage.region=us-east-1
app.storage.bucket=dev-bucket

Usage:

./setup.sh dev