bash - Docker Entrypoint Why I get the wrong parameter -

i making custom docker image having dockerfile

# dockerfile moodle instance. # forked jonathan hardison's <jmh@jonathanhardison.com> docker version. https://github.com/jmhardison/docker-moodle   php:7.0-apache maintainer dimitrios desyllas <ddesyllas@freemail.gr> #original maintainer jon auer <jda@coldshore.com>  volume ["/var/moodledata"] expose 80   # let container know there no tty env debian_frontend noninteractive  # moodle info env moodle_url http://0.0.0.0 env moodle_admin admin env moodle_admin_password admin~1234 env moodle_admin_email admin@example.com  #database settings  #supported 'pgsql', 'mariadb', 'mysqli', env moodle_db_type 'mysqli' env moodle_db_host '' env moodle_db_user '' env moodle_db_password '' env moodle_db_name 'moodle' env moodle_db_port '3306'   run echo "installing php , external tools" run apt-get update && \         apt-get -f -y install mysql-client pwgen aspell unzip wget libxmlrpc-c++8-dev libxml2-dev libpng-dev libicu-dev libmcrypt-dev &&\         docker-php-ext-install mysqli && \         docker-php-ext-install pdo pdo_mysql && \         docker-php-ext-install xmlrpc && \         docker-php-ext-install mbstring && \         docker-php-ext-install zip && \         docker-php-ext-install xml && \         docker-php-ext-install intl && \         docker-php-ext-install soap && \         docker-php-ext-install mcrypt && \         docker-php-ext-install gd && \         echo "installing moodle" && \         wget https://download.moodle.org/download.php/direct/stable31/moodle-latest-31.tgz -o /tmp/moodle-latest-31.tgz  && \         rm -rf /var/www/html/index.html && \         tar -xvf /tmp/moodle-latest-31.tgz -c /tmp && \         mv /tmp/moodle/* /var/www/html/  copy moodle-config.php /var/www/html/config.php copy ./entrypoint.sh /usr/local/bin/entrypoint.sh run chmod +x /usr/local/bin/entrypoint.sh  # cleanup run apt-get clean autoclean && apt-get autoremove -y && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /var/lib/dpkg/* /var/lib/cache/* /var/lib/log/*  entrypoint /usr/local/bin/entrypoint.sh cmd ["/usr/sbin/apache2ctl", "-d", "foreground"] 

but reason on following entrypoint.sh script wrong parameter exec

#!/bin/bash  echo "installing moodle"  echo "fixing files , permissions"  chown -r www-data:www-data /var/www/html find /var/www/html -iname "*.php" | xargs chmod +x  echo "placeholder" > /var/moodledata/placeholder chown -r www-data:www-data /var/moodledata chmod 777 /var/moodledata  echo "setting database" : ${moodle_db_type:='mysqli'}  if [ "$moodle_db_type" = "mysqli" ] || [ "$moodle_db_type" = "mariadb" ];    set ${moodle_db_host:=$db_port_3306_tcp_addr}    echo "waiting mysql connect.."   while ! mysqladmin ping -h"$moodle_db_host" --silent;       sleep 1   done    echo "setting database connection info" : ${moodle_db_user:=${db_env_mysql_user:-root}} : ${moodle_db_name:=${db_env_mysql_database:-'moodle'}} : ${moodle_db_port:=${db_port_3306_tcp_port}}    if [ "$moodle_db_user" = 'root' ]; : ${moodle_db_password:=$db_env_mysql_root_password}   else : ${moodle_db_password:=$db_env_mysql_password}   fi    if [ -z "$moodle_db_password" ];     echo >&2 'error: missing required moodle_db_password environment variable'     echo >&2 '  did forget -e moodle_db_password=... ?'     echo >&2     exit 1   fi  else   echo >&2 "this database type not supported"   echo >&2 "did forget -e moodle_db_type='mysqli' ^or^ -e moodle_db_type='mariadb' ?"   exit 1 fi  echo "installing moodle" php /var/www/html/admin/cli/install_database.php \           --adminemail=${moodle_admin_email} \           --adminuser=${moodle_admin} \           --adminpass=${moodle_admin_password} \           --agree-license  exec "$@" 

but on exec "$@" "$@" value docker's ip instead of comment start apache /usr/sbin/apache2ctl -d foreground , cannot figure out why happen.

the original work in https://github.com/ellakcy/docker-moodle

remove set in line set ${moodle_db_host:=$db_port_3306_tcp_addr} script.

$ set set: set [-abefhkmnptuvxbchp] [-o option-name] [--] [arg ...]     set or unset values of shell options , positional parameters.