use *jq* to filter json logs and convert some data into csv mode

filter_json_logs.sh

pattern="*.log" #change to your file pattern
# need to install jq
function filter_function(){
    file=$1
    cat $file |jq -r 'select(.userid==100) |[.userid, .name, .age, .type] |@csv'
}

files=$(ls $pattern)
for file in $files ; do
    echo "current_file:$file"
    filter_function $file
done