replaceKeyValue.sh

#!/bin/bash -x

if [ $# -lt 3 ]; then
    echo "ERROR: --- Usage: $0 <config_file> <key> <value> [<delimiter>] [<prefix-pattern>]"
    echo "e.g."
    echo './replaceKeyValue.sh \"elasticsearch.yml\" \"^network.host\" \"172.20.1.92\" \":\" \"# network\" '
    exit 1
fi

CONFIG_FILE=${1}
TARGET_KEY=${2}
REPLACEMENT_VALUE=${3}
DELIMITER_TOKEN=${4:-:}
PREFIX_PATTERN=${5:-}

if [ ! -f "$CONFIG_FILE" ]; then
    echo "*** ERROR $CONFIG_FILE: Not found!"
    exit 1
fi

if grep -q "${TARGET_KEY} *${DELIMITER_TOKEN}" ${CONFIG_FILE}; then   
    #sudo sed -c -i "s/\($TARGET_KEY *= *\).*/\1$REPLACEMENT_VALUE/" $CONFIG_FILE
    sudo sed -c -i "s/\(${TARGET_KEY} *${DELIMITER_TOKEN} *\).*/\1${REPLACEMENT_VALUE}/" ${CONFIG_FILE}
else
    if [ "$PREFIX_PATTERN" == "" ]; then
        #echo "$TARGET_KEY= $REPLACEMENT_VALUE" | sudo tee -a $CONFIG_FILE
        echo "${TARGET_KEY}${DELIMITER_TOKEN} ${REPLACEMENT_VALUE}" | sudo tee -a ${CONFIG_FILE}
    else
        sudo sed -i "/${PREFIX_PATTERN}/a \
${TARGET_KEY}${DELIMITER_TOKEN} ${REPLACEMENT_VALUE}" ${CONFIG_FILE}
    fi
fi