diff --git a/src/Script/isScriptFilename.ts b/src/Script/isScriptFilename.ts
index 3506828e6..b7f13b174 100644
--- a/src/Script/isScriptFilename.ts
+++ b/src/Script/isScriptFilename.ts
@@ -1,3 +1,5 @@
+export const validScriptExtensions: Array<string> = [`.js`, `.script`, `.ns`];
+
 export function isScriptFilename(f: string): boolean {
-  return f.endsWith(".js") || f.endsWith(".script") || f.endsWith(".ns");
+  return validScriptExtensions.some((ext) => f.endsWith(ext));
 }
diff --git a/src/Terminal/commands/check.ts b/src/Terminal/commands/check.ts
index be734864a..0bc198a2f 100644
--- a/src/Terminal/commands/check.ts
+++ b/src/Terminal/commands/check.ts
@@ -3,7 +3,7 @@ import { IRouter } from "../../ui/Router";
 import { IPlayer } from "../../PersonObjects/IPlayer";
 import { BaseServer } from "../../Server/BaseServer";
 import { findRunningScript } from "../../Script/ScriptHelpers";
-import { isScriptFilename } from "../../Script/isScriptFilename";
+import { isScriptFilename, validScriptExtensions } from "../../Script/isScriptFilename";
 
 export function check(
   terminal: ITerminal,
@@ -13,19 +13,21 @@ export function check(
   args: (string | number | boolean)[],
 ): void {
   if (args.length < 1) {
-    terminal.error("Incorrect number of arguments. Usage: check [script] [arg1] [arg2]...");
+    terminal.error(`Incorrect number of arguments. Usage: check [script] [arg1] [arg2]...`);
   } else {
     const scriptName = terminal.getFilepath(args[0] + "");
     // Can only tail script files
     if (!isScriptFilename(scriptName)) {
-      terminal.error("tail can only be called on .script files (filename must end with .script)");
+      terminal.error(
+        `'check' can only be called on scripts files (filename must end with ${validScriptExtensions.join(", ")})`,
+      );
       return;
     }
 
-    // Check that the script exists on this machine
+    // Check that the script is running on this machine
     const runningScript = findRunningScript(scriptName, args.slice(1), server);
     if (runningScript == null) {
-      terminal.error("No such script exists");
+      terminal.error(`No script named ${scriptName} is running on the server`);
       return;
     }
     runningScript.displayLog();
diff --git a/src/Terminal/commands/kill.ts b/src/Terminal/commands/kill.ts
index b2eca0431..be18d733a 100644
--- a/src/Terminal/commands/kill.ts
+++ b/src/Terminal/commands/kill.ts
@@ -27,7 +27,7 @@ export function kill(
       if (res) {
         terminal.print(`Killing script with PID ${pid}`);
       } else {
-        terminal.error(`Failed to kill script with PID ${pid}. No such script exists`);
+        terminal.error(`Failed to kill script with PID ${pid}. No such script is running`);
       }
 
       return;
diff --git a/src/Terminal/commands/mem.ts b/src/Terminal/commands/mem.ts
index 799af2181..42abc25ea 100644
--- a/src/Terminal/commands/mem.ts
+++ b/src/Terminal/commands/mem.ts
@@ -29,7 +29,7 @@ export function mem(
 
     const script = terminal.getScript(player, scriptName);
     if (script == null) {
-      terminal.error("No such script exists!");
+      terminal.error("mem failed. No such script exists!");
       return;
     }
 
diff --git a/src/Terminal/commands/scp.ts b/src/Terminal/commands/scp.ts
index f1561d6d4..d5def4d68 100644
--- a/src/Terminal/commands/scp.ts
+++ b/src/Terminal/commands/scp.ts
@@ -90,7 +90,7 @@ export function scp(
       }
     }
     if (sourceScript == null) {
-      terminal.error("scp() failed. No such script exists");
+      terminal.error("scp failed. No such script exists");
       return;
     }
 
diff --git a/src/Terminal/commands/tail.ts b/src/Terminal/commands/tail.ts
index 1773d472f..d1101e76a 100644
--- a/src/Terminal/commands/tail.ts
+++ b/src/Terminal/commands/tail.ts
@@ -3,7 +3,7 @@ import { IRouter } from "../../ui/Router";
 import { IPlayer } from "../../PersonObjects/IPlayer";
 import { BaseServer } from "../../Server/BaseServer";
 import { findRunningScriptByPid } from "../../Script/ScriptHelpers";
-import { isScriptFilename } from "../../Script/isScriptFilename";
+import { isScriptFilename, validScriptExtensions } from "../../Script/isScriptFilename";
 import { compareArrays } from "../../utils/helpers/compareArrays";
 import { LogBoxEvents } from "../../ui/React/LogBoxManager";
 
@@ -20,7 +20,7 @@ export function tail(
     } else if (typeof commandArray[0] === "string") {
       const scriptName = terminal.getFilepath(commandArray[0]);
       if (!isScriptFilename(scriptName)) {
-        terminal.error("tail can only be called on .script, .ns, .js files, or by pid");
+        terminal.error(`tail can only be called on ${validScriptExtensions.join(", ")} files, or by PID`);
         return;
       }
 
@@ -66,11 +66,11 @@ export function tail(
       }
 
       // if there's no candidate then we just don't know.
-      terminal.error("No such script exists.");
+      terminal.error(`No script named ${scriptName} is running on the server`);
     } else if (typeof commandArray[0] === "number") {
       const runningScript = findRunningScriptByPid(commandArray[0], server);
       if (runningScript == null) {
-        terminal.error("No such script exists");
+        terminal.error(`No script with PID ${commandArray[0]} is running on the server`);
         return;
       }
       LogBoxEvents.emit(runningScript);