do error checking

calc.go

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

command.go

@@ -305,15 +305,6 @@ func (c *Calc) SetCommands() {
 
 	// aliases
 	c.Commands["quit"] = c.Commands["exit"]
-
-	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"]
+	c.SettingsCommands["undebug"] = c.SettingsCommands["nodebug"]
+	c.SettingsCommands["show"] = c.SettingsCommands["showstack"]
 }

rpn.go

@@ -198,17 +198,6 @@ 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

@@ -213,17 +213,6 @@ 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