Grap keys from bunch of .properties files with keys with [a-z _ .]

get_prop_keys.bash

#!/usr/bin/env bash

# files with prop keys on each line
KEYS_FILE="/path/to/result.list"

# Extract keys to file
awk -F =  '/^[a-z_.]+=/ { print $1 }' /some/path/files > "$KEYS_FILE"

# path to some repo
SEARCH_PATH="/path/to/repo"

# Search each prop key in given folder with exclusions
while IFS='' read -r line || [[ -n "$line" ]];
do
    echo "Parse $SEARCH_PATH for $line"

    RESULT=$(fgrep "$line" \
        --exclude .git/** \
        --exclude binaries/** \
        --recursive \
        "$SEARCH_PATH")

    if [[ -n "$RESULT" ]]
    then
        echo "$RESULT" > "results/${line}.result"
    fi
done < "$KEYS_FILE"