added a couple of shortcuts

calc.go

@@ -121,19 +121,27 @@ func (c *Calc) GetCompleteCustomFuncalls() func(string) []string {
 		}
 
 		for command := range c.SettingsCommands {
-			completions = append(completions, command)
+			if len(command) > 1 {
+				completions = append(completions, command)
+			}
 		}
 
 		for command := range c.ShowCommands {
-			completions = append(completions, command)
+			if len(command) > 1 {
+				completions = append(completions, command)
+			}
 		}
 
 		for command := range c.StackCommands {
-			completions = append(completions, command)
+			if len(command) > 1 {
+				completions = append(completions, command)
+			}
 		}
 
 		for command := range c.Commands {
-			completions = append(completions, command)
+			if len(command) > 1 {
+				completions = append(completions, command)
+			}
 		}
 
 		return completions

command.go

@@ -305,6 +305,15 @@ func (c *Calc) SetCommands() {
 
 	// aliases
 	c.Commands["quit"] = c.Commands["exit"]
-	c.SettingsCommands["undebug"] = c.SettingsCommands["nodebug"]
-	c.SettingsCommands["show"] = c.SettingsCommands["showstack"]
+
+	c.SettingsCommands["d"] = c.SettingsCommands["debug"]
+	c.SettingsCommands["b"] = c.SettingsCommands["batch"]
+	c.SettingsCommands["s"] = c.SettingsCommands["showstack"]
+
+	c.ShowCommands["h"] = c.ShowCommands["history"]
+	c.ShowCommands["p"] = c.ShowCommands["dump"]
+	c.ShowCommands["v"] = c.ShowCommands["vars"]
+
+	c.StackCommands["c"] = c.StackCommands["clear"]
+	c.StackCommands["u"] = c.StackCommands["undo"]
 }

rpn.go

@@ -198,6 +198,17 @@ DESCRIPTION
 
     Refer to https://pkg.go.dev/math for details about those functions.
 
+    There are also a number of shortcuts for some commands available:
+
+        d    debug
+        b    batch
+        s    showstack
+        h    history
+        p    dump (aka print)
+        v    vars
+        c    clear
+        u    undo
+
 INTERACTIVE REPL
     While you can use rpn in the command-line, the best experience you'll
     have is the interactive repl (read eval print loop). Just execute "rpn"

rpn.pod

@@ -213,6 +213,17 @@ Register variables:
 
 Refer to https://pkg.go.dev/math for details about those functions.
 
+There are also a number of shortcuts for some commands available:
+
+    d    debug
+    b    batch
+    s    showstack
+    h    history
+    p    dump (aka print)
+    v    vars
+    c    clear
+    u    undo
+
 =head1 INTERACTIVE REPL
 
 While you can use rpn in the command-line, the best experience you'll