diff --git a/README.md b/README.md
index 444557c9..460c8ace 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,26 @@ Test the C Program for the desired output.
 # PROGRAM:
 
 ## C Program to print process ID and parent Process ID using Linux API system calls
+```
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+int main(void)
+{	//variable to store calling function's process id
+	pid_t process_id;
+	//variable to store parent function's process id
+	pid_t p_process_id;
+	//getpid() - will return process id of calling function
+	process_id = getpid();
+	//getppid() - will return process id of parent function
+	p_process_id = getppid();
+	//printing the process ids
 
+//printing the process ids
+	printf("The process id: %d\n",process_id);
+	printf("The process id of parent function: %d\n",p_process_id);
+	return 0; }
+```
 
 
 
@@ -40,7 +59,13 @@ Test the C Program for the desired output.
 
 
 
-##OUTPUT
+##OUTPUT:
+```
+localhost:~# gcc -o output.c pidcheck.c
+localhost:~# ./output.c
+The process id: 96
+The process id of parent function: 61
+```
 
 
 
@@ -56,29 +81,99 @@ Test the C Program for the desired output.
 
 
 ## C Program to create new process using Linux API system calls fork() and exit()
+```
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int main() {
+    int pid;
+    pid = fork();
+    if (pid == 0) {
+        printf("I am child, my pid is %d\n", getpid());
+        printf("My parent pid is: %d\n", getppid());
+        exit(0);
+    } else {
+        printf("I am parent, my pid is %d\n", getpid());
+        sleep(100);
+        exit(0);
+    }
+}
+```
+##OUTPUT:
+```
+localhost:~# gcc -o output.c pidcheck.c
+localhost:~# ./output.c
+I am parent, my pid is 96
+I am child, my pid is 97
+My parent pid is: 96
+```
 
+## C Program to execute Linux system commands using Linux API system calls exec() family
+```
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <unistd.h>
 
+int main() {
+    int status;
+    pid_t pid;
 
+    printf("Running ps with execlp\n");
+    pid = fork();
+    
+    if (pid == 0) {
+        // This is the child process
+        execlp("ps", "ps", "ax", NULL);
+        // If execlp fails, print an error message
+        perror("execlp");
+        exit(EXIT_FAILURE);
+    } else if (pid > 0) {
+        // This is the parent process
+        wait(&status);
+        if (WIFEXITED(status)) {
+            printf("Child exited with status of %d\n", WEXITSTATUS(status));
+        } else {
+            puts("Child did not exit successfully");
+        }
+    } else {
+        // fork() failed
+        perror("fork");
+        exit(EXIT_FAILURE);
+    }
+    
+    printf("Done.\n");
 
+    printf("Running ps with execl. Now with path specified\n");
+    pid = fork();
+    
+    if (pid == 0) {
+        // This is the child process
+        execl("/bin/ps", "ps", "ax", NULL);
+        // If execl fails, print an error message
+        perror("execl");
+        exit(EXIT_FAILURE);
+    } else if (pid > 0) {
+        // This is the parent process
+        wait(&status);
+        if (WIFEXITED(status)) {
+            printf("Child exited with status of %d\n", WEXITSTATUS(status));
+        } else {
+            puts("Child did not exit successfully");
+        }
+    } else {
+        // fork() failed
+        perror("fork");
+        exit(EXIT_FAILURE);
+    }
+    
+    printf("Done.\n");
 
-
-
-
-
-
-
-
-
-##OUTPUT
-
-
-
-
-
-
-
-
-## C Program to execute Linux system commands using Linux API system calls exec() family
+    return 0;
+}
+```
 
 
 
@@ -106,6 +201,83 @@ Test the C Program for the desired output.
 
 
 ##OUTPUT
+```
+localhost:~# gcc -o output.c pidcheck.c
+localhost:~# ./output.c
+Running ps with execlp
+PID   USER     TIME  COMMAND
+    1 root      0:01 {init} /bin/sh /sbin/init
+    2 root      0:00 [kthreadd]
+    3 root      0:00 [kworker/0:0]
+    4 root      0:00 [kworker/0:0H]
+    5 root      0:00 [kworker/u2:0]
+    6 root      0:00 [mm_percpu_wq]
+    7 root      0:00 [ksoftirqd/0]
+    8 root      0:00 [kdevtmpfs]
+    9 root      0:00 [oom_reaper]
+   10 root      0:00 [writeback]
+   11 root      0:00 [kcompactd0]
+   12 root      0:00 [crypto]
+   13 root      0:00 [bioset]
+   14 root      0:00 [kblockd]
+14 root      0:00 [kblockd]
+   15 root      0:00 [kworker/0:1]
+   16 root      0:00 [kswapd0]
+   17 root      0:00 [bioset]
+   34 root      0:00 [khvcd]
+   35 root      0:00 [bioset]
+   36 root      0:00 [bioset]
+   37 root      0:00 [bioset]
+   38 root      0:00 [bioset]
+   39 root      0:00 [bioset]
+   40 root      0:00 [bioset]
+   41 root      0:00 [bioset]
+   42 root      0:00 [bioset]
+   55 root      0:00 settime -d /
+   56 root      0:00 dhcpcd -q
+   61 root      0:00 sh -l
+   62 root      0:00 [kworker/u2:1]
+  103 root      0:00 ./output.c
+  104 root      0:00 ps ax
+Child exited with status of 0
+Done.
+Running ps with execl. Now with path specified
+PID   USER     TIME  COMMAND
+1 root      0:01 {init} /bin/sh /sbin/init
+2 root      0:00 [kthreadd]
+3 root      0:00 [kworker/0:0]
+4 root      0:00 [kworker/0:0H]
+5 root      0:00 [kworker/u2:0]
+6 root      0:00 [mm_percpu_wq]
+7 root      0:00 [ksoftirqd/0]
+8 root      0:00 [kdevtmpfs]
+9 root      0:00 [oom_reaper]
+10 root      0:00 [writeback]
+11 root      0:00 [kcompactd0]
+12 root      0:00 [crypto]
+13 root      0:00 [bioset]
+14 root      0:00 [kblockd]
+15 root      0:00 [kworker/0:1]
+16 root      0:00 [kswapd0]
+17 root      0:00 [bioset]
+34 root      0:00 [khvcd]
+35 root      0:00 [bioset]
+36 root      0:00 [bioset]
+37 root      0:00 [bioset]
+38 root      0:00 [bioset]
+39 root      0:00 [bioset]
+40 root      0:00 [bioset]
+41 root      0:00 [bioset]
+42 root      0:00 [bioset]
+55 root      0:00 settime -d /
+56 root      0:00 dhcpcd -q
+61 root      0:00 sh -l
+62 root      0:00 [kworker/u2:1]
+103 root      0:00 ./output.c
+105 root      0:00 ps ax
+Child exited with status of 0
+Done.
+```