Merge pull request #1997 from urfave/bartekpacia/fix/zsh_completion_c…

…md_descriptions

Revert "fix: /bin/zsh env variable to retrieve current active shell"

examples_test.go

@@ -405,7 +405,7 @@ func ExampleCommand_Run_shellComplete_zsh() {
 
 	// Simulate a zsh environment and command line arguments
 	os.Args = []string{"greet", "--generate-shell-completion"}
-	os.Setenv("0", "/usr/bin/zsh")
+	os.Setenv("SHELL", "/usr/bin/zsh")
 
 	_ = cmd.Run(context.Background(), os.Args)
 	// Output:

help.go

@@ -164,7 +164,7 @@ func printCommandSuggestions(commands []*Command, writer io.Writer) {
 		if command.Hidden {
 			continue
 		}
-		if strings.HasSuffix(os.Getenv("0"), "zsh") {
+		if strings.HasSuffix(os.Getenv("SHELL"), "zsh") {
 			_, _ = fmt.Fprintf(writer, "%s:%s\n", command.Name, command.Usage)
 		} else {
 			_, _ = fmt.Fprintf(writer, "%s\n", command.Name)