diff --git a/fail b/fail
new file mode 100755
index 0000000..1f8ed41
Binary files /dev/null and b/fail differ
diff --git a/fail.c b/fail.c
new file mode 100644
index 0000000..0630179
--- /dev/null
+++ b/fail.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+/*
+ * This program has the purpose of returning a -1 value, indicating the shell that something has gone wrong
+ * while the program was running.
+ */
+
+int main(){
+    return -1;
+}
diff --git a/return-specified b/return-specified
new file mode 100755
index 0000000..406b9d4
Binary files /dev/null and b/return-specified differ
diff --git a/return-specified.c b/return-specified.c
new file mode 100644
index 0000000..7477ffa
--- /dev/null
+++ b/return-specified.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+ * This program takes the given argument and returns it as an integer.
+ * It might be useful to test a shell.
+ */
+
+int main(int argc, char** argv){
+    if(argc<2){
+        printf("No argument given.\n");
+        return -1;
+    }
+    return atoi(argv[1]);
+}
diff --git a/success b/success
new file mode 100755
index 0000000..4fc9eb4
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diff --git a/success.c b/success.c
new file mode 100644
index 0000000..4278030
--- /dev/null
+++ b/success.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+/*
+ * This program has the purpose of returning a 0 value, indicating to the shell that the program was
+ * executed successfully.
+ */
+
+int main(){
+    return 0;
+}