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Reputation: 349

How to read properties file using shell script

How to read config.properties file using shell script?

Example file:

key1 = This is 1st value

key2 = this is 2nd value

key3
  1. Display all key and values.
  2. How to check which key don't have value?
  3. Enter any key that key related value display.

Upvotes: 4

Views: 16139

Answers (3)

Oleg Shalaev
Oleg Shalaev

Reputation: 179

Here is a simplified version of the (bash) script I use in my projects:

# reading CONFIG FILE
# usage: readConf <fileName> <several variable names>
function readConf {
local confFile=$1
shift
local allowedVars="$@" # only specified variable names will be processed
local forbidden=" #@%*()<>~'\"{}[]\$"

for VN in $allowedVars; do
    unset $VN
done

while IFS== read -r key val ; do
    var=${key//["$forbidden"]}
    if [[ " ${allowedVars[@]} " =~ " $var " ]]; then
    val=${val//["$forbidden"]}
    eval "${var}=\"${val}\""
    else
    if ! [ -z $var ]; then
        echo "conf parameter: \"$var\" is not supposed to be defined in \"$confFile\""
    fi
    fi
done < <(grep -v "^#" $confFile)
}

It scans config file (first argument) for specified parameters (remaining arguments). Certain "forbidden symbols" are ignored to avoid code injections. Lines starting with '#' are ignored.

Upvotes: 0

flopcoder
flopcoder

Reputation: 1175

You can try this. its also contain database operations:you can get all answers that you wanted if you clearly understood this code

  #!/bin/bash
    PROPERTY_FILE=filename.properties

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

    echo "# Reading property from $PROPERTY_FILE"
    DB_USER=$(getProperty "db.username")
    DB_PASS=$(getProperty "db.password")
    ROOT_LOC=$(getProperty "root.location")
    echo $DB_USER
    echo $DB_PASS
    echo $ROOT_LOC
    echo "Writing on DB ... "
    mysql -u$DB_USER -p$DB_PASS dbname<<EOFMYSQL

    update tablename set tablename.value_ = "$ROOT_LOC" where tablename.name_="Root directory location";
    EOFMYSQL
    echo "Writing root location($ROOT_LOC) is done ... "
    counter=`mysql -u${DB_USER} -p${DB_PASS} dbname -e "select count(*) from tablename where tablename.name_='Root directory location' and tablename.value_ = '$ROOT_LOC';" | grep -v "count"`;

    if [ "$counter" = "1" ]
    then
    echo "ROOT location updated"
    fi

Upvotes: 2

rurouni88
rurouni88

Reputation: 1173

Try the following:

#!/bin/bash

# Read configuration into an associative array
declare -A CONFIG
# IFS is the 'internal field separator'. In this case, your file uses '='
IFS="="
while read -r key value
do
    if [ -n $value ]; then
        CONFIG[$key]=$value
    else
        CONFIG[$key]=$value
    fi
done < YOUR_CONFIG_FILENAME
unset IFS

# If a parameter is passed, look it up by that, else print everything.
if [ $1 ]; then
    if [ -n ${CONFIG[$1]} ]; then
        echo "Key: $1, Value: ${CONFIG[$1]}"
    else
        echo "The key '$1' does not exist"
    fi
else
    for key in "${!CONFIG[@]}"; do
        if [ -n ${CONFIG[$key]} ]; then
            echo "Key: $key, Value: ${CONFIG[$key]}"
        else
            echo "Key: $key has no value"
        fi
    done
fi

exit $?

It will read in all keynames in the config file and inform you if no value is set against the key, meeting (1) and (2) of your requirements.

I don't quite understand what the requirements are for (3) though

"3) enter any key that key related value display" Update the script with that requirement.

Upvotes: 4

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