how to assign variable in shell script

Question

I have below shell script code which is working fine.

#!/bin/sh

run() {
  cd /tmp/in/current 
  java \
    -Dlog4j.configurationFile=/tmp/in/logging/log4j2_Importer.xml \
    -Djava.security.egd=file:///dev/urandom \
    -classpath /tmp/in/runner/lib/*:/tmp/in/lib/* \
    baag.runner.Application \
    --config /tmp/in/config/import.dev.properties.TODO \
    --workflow import \
    --inputDir "$1"
}

dev_path="/data/etl-dev/in/eurex"
simu_path="/data/etl-simu/in/eurex"

mode=$1

case "$mode" in
    "$dev_path" | "$simu_path" ) 
        run "$mode" 
        ;;
    *)  echo "error: invalid mode" >&2
        exit 1
        ;;
esac

But currently i can run this code only on dev database as you can see in run function script the import.dev.properties.TODO is set as dev. I want to make this flexible such that if the path is "/tmp/in/simu" for simu_path variable then the properties should be import.simu.properties.TODO and for dev_path it should be import.dev.properties.TODO so that it will run on the respective database.

I am not sure if its possible to set parametarized variable here. For example something like this import.${varaible_here_dev_or_simu}.properties.TODO

I want to keep the dev_path and simu_path as it is as it can be changed as i am passing this in argument

Answer 1

Change import.dev.properties.TODO to import."$2".properties.TODO in run function. And use it like this.

run "$mode" "$whatever_you_name_it"

And we could ref this a bit

#!/bin/sh

path="${1:-/tmp/in}" # set /tmp/in as default path
mode="${2:-dev}"     # set dev as default mode
# or switch them if mode needs to be changed more recent
#path="${2:-/tmp/in}"
#mode="${1:-dev}"

run() {
    cd "$path"/current
    java -classpath "$path"/runner/lib/*:"$path"/lib/* baag.runner.Application \
         -Dlog4j.configurationFile="$path"/logging/log4j2_Importer.xml \
         --config "$path"/config/import.$1.properties.TODO" \
         -Djava.security.egd=file:///dev/urandom \
         --inputDir "$path/$1" \
         --workflow import
}

case "$mode" in
    "dev|simu") run "$mode" ;;
    *         ) echo "error: invalid mode" >&2; exit 1;;
esac

Answer 2

As far as I know, bash unfortunately does not support constructs like associative arrays, which could be a possible solution, prior version 4.

If the paths for the environments all look like the same, you could write it like this.

#!/bin/sh

base_path="/tmp/in"

dev_env="dev"
simu_env="simu"

run() {
cd /tmp/in/current; java -Dlog4j.configurationFile=/tmp/in/logging/log4j2_Importer.xml -Djava.security.egd=file:///dev/urandom -classpath /tmp/in/runner/lib/*:/tmp/in/lib/* baag.runner.Application --config /tmp/in/config/import.$1.properties.TODO --workflow import --inputDir "$base_path/$1"
}

mode=$1

case "$mode" in
    "$dev_env" | "$simu_env" ) 
        run "$mode" 
        ;;
    *)  echo "error: invalid mode" >&2
        exit 1
        ;;
esac

Note: In this implementation you would have to pass dev or simu to the script instead of the whole path. If you need to pass the complete path you have to change the "$dev_env" | "$simu_env" ) "$dev_env" | "$simu_env" ) to "$base_path/$dev_env" | "$base_path/$simu_env" ) "$base_path/$dev_env" | "$base_path/$simu_env" )

UPDATE

Assuming the path structure and the environments are fixed, you can extract the environment with a simple regex and pass it to the function as the seconds parameter, like so:

#!/bin/sh

dev_path="/data/etl-dev/in/eurex"
simu_path="/data/etl-simu/in/eurex"
prod_path="/data/etl-prod/in/eurex"

environments="(dev|simu|prod)"

run() {
    cd /tmp/in/current; java -Dlog4j.configurationFile=/tmp/in/logging/log4j2_Importer.xml -Djava.security.egd=file:///dev/urandom -classpath /tmp/in/runner/lib/*:/tmp/in/lib/* baag.runner.Application --config /tmp/in/config/import.$2.properties.TODO --workflow import --inputDir "$1"
}

mode=$1

case "$mode" in
    "$dev_path" | "$simu_path" )
        environment=$(echo $mode | sed -E "s/.*${environments}.*/\\1/")
        run "$mode" $environment
        ;;
    *)  echo "error: invalid mode" >&2
        exit 1
        ;;
esac