diff --git a/OS/C/theory/sync/semaextraposts.c b/OS/C/theory/sync/semaextraposts.c
new file mode 100644
index 0000000..5196b8e
--- /dev/null
+++ b/OS/C/theory/sync/semaextraposts.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <sys/semaphore.h>
+
+sem_t my_semaphore;
+
+int main(){
+    sem_init(&my_semaphore, 0, 5);
+    int sem_val;
+    sem_getvalue(&my_semaphore, &sem_val);
+    printf("Semaphore value after extra posts: %d\n", sem_val);
+
+    sem_post(&my_semaphore);
+    sem_post(&my_semaphore);
+    sem_post(&my_semaphore);
+
+    sem_getvalue(&my_semaphore, &sem_val);
+    printf("Semaphore value after extra posts: %d\n", sem_val);
+
+    sem_destroy(&my_semaphore);
+    return 0;
+}
diff --git a/OS/bash/progcheck/hello/apple b/OS/bash/progcheck/hello/apple
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/hello/banana b/OS/bash/progcheck/hello/banana
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/hello/chicken b/OS/bash/progcheck/hello/chicken
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/hello/hello b/OS/bash/progcheck/hello/hello
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/hello/orange b/OS/bash/progcheck/hello/orange
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/hello/world b/OS/bash/progcheck/hello/world
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/solenhanced.sh b/OS/bash/progcheck/solenhanced.sh
new file mode 100755
index 0000000..6f9fdf8
--- /dev/null
+++ b/OS/bash/progcheck/solenhanced.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+folder="$@"
+
+for j in $folder
+do
+echo "Checking $j"
+
+x=`find "$j" -type f -iname "[!aeiou]*"`
+
+for i in $x
+do
+    echo "$i"
+done
+done
+
+# This script takes a folder name as a CLI argument and then lists all files that do not begin with a vowel (in filename)
diff --git a/OS/bash/progcheck/test/apple b/OS/bash/progcheck/test/apple
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/test/banana b/OS/bash/progcheck/test/banana
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/test/chicken b/OS/bash/progcheck/test/chicken
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/test/hello b/OS/bash/progcheck/test/hello
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/test/orange b/OS/bash/progcheck/test/orange
new file mode 100644
index 0000000..e69de29
diff --git a/OS/bash/progcheck/test/world b/OS/bash/progcheck/test/world
new file mode 100644
index 0000000..e69de29