diff --git a/pq-confo/cfg.txt b/pq-confo/cfg.txt
new file mode 100644
index 0000000..5e4f533
--- /dev/null
+++ b/pq-confo/cfg.txt
@@ -0,0 +1,12 @@
+api =
+{
+port = 65535;
+};
+pq =
+{
+db = "database";
+host = "localhost";
+port = 5432;
+secret = "secret";
+user = "user";
+}
diff --git a/pq-confo/main.c b/pq-confo/main.c
new file mode 100644
index 0000000..6aa41f7
--- /dev/null
+++ b/pq-confo/main.c
@@ -0,0 +1,41 @@
+/*to use *print**/
+#include <stdio.h>
+/*to use struct pq_confo*/
+#include "pqconfo.h"
+
+int main(int argc, char *argv[]) {
+
+  /*read command line*/
+  if (argc > 1){
+    fprintf(stdout,"main() Started...\n");
+    printf("main() argv[1]: %s\n", argv[1]);
+  }else{
+    fprintf(stderr, "Usage: %s <path to config file>\n", argv[0]);
+    return 1;
+  }
+
+  int pqConfoRet;
+  const struct pq_confo * pqConfo;
+
+  /*get Postgresql connection info*/
+  /*TODO Validate argv!*/
+  pqConfoRet=get_pq_confo(argv[1],&pqConfo);
+  if(pqConfoRet){
+    fprintf(stderr, "Postgresql connection information are NOT valid\n");
+    return 2;
+  }else{
+    fprintf(stdout,"pqConfoRet: %d\n",pqConfoRet);
+  }
+ 
+  /*free Postgresql connection info*/
+  pqConfoRet=free_pq_confo(&pqConfo);
+  if(pqConfoRet){
+    fprintf(stderr, "Postgresql connection information are NOT free\n");
+    return 3;
+  }else{
+    fprintf(stdout,"pqConfoRet: %d\n",pqConfoRet);
+  }
+
+  fprintf(stdout,"main() Done.\n");
+  return 0;
+}
diff --git a/pq-confo/makefile b/pq-confo/makefile
new file mode 100644
index 0000000..d54ae9a
--- /dev/null
+++ b/pq-confo/makefile
@@ -0,0 +1,22 @@
+#target: dependency_1 dependency_2 dependency_3 ...
+#	command
+#
+RM = /bin/rm -f
+OBJ = main.o pqconfo.o
+EXE = main
+CC = /usr/bin/gcc
+CFLAGS = -Wall
+#
+all: main
+#
+$(EXE): $(OBJ)
+	$(CC) $(CFLAGS) $(OBJ) -L/usr/lib/x86_64-linux-gnu -lconfig -o $(EXE)
+#
+pqconfo.o: pqconfo.c pqconfo.h
+	$(CC) -c pqconfo.c -o pqconfo.o
+#
+main.o: main.c 
+	$(CC) -c main.c -o main.o
+#
+clean:
+	$(RM) $(OBJ) $(EXE) *~
diff --git a/pq-confo/pqconfo.c b/pq-confo/pqconfo.c
new file mode 100644
index 0000000..993ecf2
--- /dev/null
+++ b/pq-confo/pqconfo.c
@@ -0,0 +1,91 @@
+/*to use malloc*/
+#include <stdlib.h>
+/*to use libconfig*/
+#include <libconfig.h>
+/*to use struct pq_confo*/
+#include "pqconfo.h"
+
+/*get Postgresql connection information*/
+int get_pq_confo(const char * file,const struct pq_confo ** confo){
+  /*declaration*/
+  config_t cfg;
+  const char * db, * host, * secret, * user;
+  int port;
+
+  fprintf(stdout,"get_pq_confo() Started...\n");
+  /*initialise new and EMPTY config*/
+  config_init(&cfg);
+
+  /* Read the file. If there is an error, report it and exit. */
+  /*TODO Validate config file name!*/
+  if(! config_read_file(&cfg, file))
+  {
+    fprintf(stderr, "get_pq_confo() %s:%d - %s\n", config_error_file(&cfg),
+            config_error_line(&cfg), config_error_text(&cfg));
+    /*destroy config, BUT NOT the structure*/
+    config_destroy(&cfg);
+    return 2;
+  }
+  fprintf(stdout,"get_pq_confo() Parsing config file done\n");
+
+  /*lookup db string*/
+  if(config_lookup_string(&cfg, "pq.db", &db)){
+    printf("get_pq_confo() db: %s\n", db);
+  }else{
+    fprintf(stderr, "get_pq_confo() NO 'db' setting in config file found.\n");
+    return 3;
+  }
+
+  /*lookup host string*/
+  if(config_lookup_string(&cfg, "pq.host", &host)){
+    printf("get_pq_confo() host: %s\n", host);
+  }else{
+    fprintf(stderr, "get_pq_confo() NO 'host' setting in config file found.\n");
+    return 4;
+  }
+
+  /*lookup secret string*/
+  if(config_lookup_string(&cfg, "pq.secret", &secret)){
+    printf("get_pq_confo() secret: %s\n", secret);
+  }else{
+    fprintf(stderr, "get_pq_confo() NO 'secret' setting in config file found.\n");
+    return 5;
+  }
+
+  /*lookup user string*/
+  if(config_lookup_string(&cfg, "pq.user", &user)){
+    printf("get_pq_confo() user: %s\n", user);
+  }else{
+    fprintf(stderr, "get_pq_confo() NO 'user' setting in config file found.\n");
+    return 6;
+  }
+
+  /*lookup port int*/
+  if(config_lookup_int(&cfg, "pq.port", &port)){
+    printf("get_pq_confo() port: %d\n", port);
+  }else{
+    fprintf(stderr, "get_pq_confo() NO 'port' setting in config file found.\n");
+    return 7;
+  }
+
+  /*create struct*/
+  struct pq_confo * pqConfo = (struct pq_confo  *)malloc( sizeof(struct pq_confo));
+  sprintf(pqConfo->db,"%s",db);
+  sprintf(pqConfo->host,"%s",host);
+  pqConfo->port=port;
+  sprintf(pqConfo->secret,"%s",secret);
+  sprintf(pqConfo->user,"%s",user);
+  *confo = pqConfo;
+
+  /*destroy config, BUT NOT the structure*/
+  config_destroy(&cfg);
+
+  /*return success*/
+  return 0;
+}
+
+/*free Postgresql connection information*/
+int free_pq_confo(const struct pq_confo ** confo){
+  free((struct pq_confo *)*confo);
+  return 0;
+}
diff --git a/pq-confo/pqconfo.h b/pq-confo/pqconfo.h
new file mode 100644
index 0000000..24eb475
--- /dev/null
+++ b/pq-confo/pqconfo.h
@@ -0,0 +1,21 @@
+/*We can use CPP tricks to avoid parsing the same header file more than once*/
+#ifndef PQCONFO_H
+# define PQCONFO_H
+
+/*structure for Postgresql connection information*/
+struct pq_confo
+{
+  char db[23];
+  char host[23];
+  int port;
+  char secret[42];
+  char user[23];
+};
+
+/*get Postgresql connection information*/
+int get_pq_confo(const char * file,const struct pq_confo ** confo);
+
+/*free Postgresql connection information*/
+int free_pq_confo(const struct pq_confo ** confo);
+
+#endif /* PQCONFO_H */
diff --git a/pq-confo/readme.md b/pq-confo/readme.md
new file mode 100644
index 0000000..95d7b43
--- /dev/null
+++ b/pq-confo/readme.md
@@ -0,0 +1,23 @@
+* install dependencies on Debian Bullseye
+
+```
+sudo apt install libconfig-dev --no-install-recommends
+```
+
+* build
+
+```
+make clean all
+```
+
+* cleanup
+
+```
+make clean
+```
+
+* run
+
+```
+Usage: ./main <path to config file>
+```