Read property from properties file within Shell Script

reading-property-from-file.sh

#!/bin/sh

PROPERTY_FILE=apps.properties

function getProperty {
   PROP_KEY=$1
   PROP_VALUE=`cat $PROPERTY_FILE | grep "$PROP_KEY" | cut -d'=' -f2`
   echo $PROP_VALUE
}

echo "# Reading property from $PROPERTY_FILE"
REPOSITORY_URL=$(getProperty "nexus.repository.url")

It won't work when the property is commented out.

The trouble with all these suggestions is that the resulting value could have a newline character.

cat ${PROPERTY_FILE} | grep -w version | cut -d '=' -f 2 | tr -d '\n'

This script does not work when the variable and the value are the same.

prop1=prop1

The trouble with all these suggestions is that the resulting value could have a newline character.

cat ${PROPERTY_FILE} | grep -w version | cut -d '=' -f 2 | tr -d '\n'

You can also strip out carriage returns as follows:

cat "${PROPERTY_FILE}" | grep -w version | cut -d '=' -f 2 | tr -d '\n\r'

tr will treat the '\n\r' specification as a list of characters to delete (in any order, whether alone or together). Handy if your property file was created on a Windows system.

This script does not work when the variable and the value are the same.

Try this:

cat "${PROPERTY_FILE}" | grep --color=never "prop1=" | cut -d '=' -f 2 | tr -d '\n\r'

Requires the = to immediately follow the property name.

Taking into account SC2002, use:

grep "$PROP_KEY" "$PROPERTY_FILE" | cut -d '=' -f2

Thanks for example, @marcelbirkner, really useful.