diff --git a/example.in b/example.in
new file mode 100644
index 0000000..52bcfbd
--- /dev/null
+++ b/example.in
@@ -0,0 +1,26 @@
+AlmaLinux
+Alpine
+Apache
+Arch
+CentOS
+Ceph
+CPAN
+Cygwin
+Debian
+DebianCD
+DebianMultimedia
+DebianPorts
+DebianSecurity
+Eclipse
+Fedora
+FreeBSD
+GentooDistfiles
+GentooPortage
+GNOME
+GNU
+Gutenberg
+IPFire
+KDE
+KDEApplicationData
+Kernel
+OpenBSD
diff --git a/main.py b/main.py
index 6de60ca..410d631 100644
--- a/main.py
+++ b/main.py
@@ -6,6 +6,7 @@ This mirror status checker determines whether CSC mirror is up-to-date with upst
 
 import time
 import os
+import sys
 import requests
 from arch import Arch
 from ceph import Ceph
@@ -106,8 +107,12 @@ if __name__ == "__main__":
 
     with open("data.json", "r", encoding = "utf-8") as file:
         data = json.load(file)
+        if sys.stdin.isatty():
+            distros = data
+        else:
+            distros = [distro.rstrip() for distro in sys.stdin.readlines()]
         current_time = int(time.time())
-        for distro in data:
+        for distro in distros:
             try:
                 if distro == "CPAN":
                     res_json = requests.get("http://mirrors.cpan.org/cpan-json.txt").json()
@@ -134,6 +139,9 @@ if __name__ == "__main__":
                         continue
                 elif distro == "IPFire":
                     checker_result = ipfire_checker()
+                elif distro not in data:
+                    print(f"Failure: {distro} does not exist")
+                    continue
                 else:
                     checker_result = general_checker(data, distro)
                 if checker_result: