fix bugs

README.md

@@ -138,7 +138,7 @@ A bar-style prompt showing current time, execution time of the last command
 | `rmspc` | filefct | Replace spaces in filenames with underscores (or a custom character) |
 | `setc` | lang | Set locale to standard C (POSIX) |
 | `setlocale` | lang | Set console locale to any installed locale |
-| `settrace` | debug | Activate or deactivate ERR trap to display backtrace on script errors |
+| `settrace` | debug | Activate (`--on`), deactivate (`--off`) or query (`--status`) an ERR trap that prints the exit status and a call stack (on stderr) for each failing command; `--force` replaces/removes an ERR trap set by something else; active at startup when `SETTRACE_DEFAULT_ENABLED=1` |
 | `showinfo` | info | Display welcome banner and system information (figlet + neofetch/fastfetch) |
 | `ssr` | ssh | SSH into a server as root, forwarding extra ssh options |
 | `taz` | compress | Compress files and directories into a chosen archive format |
@@ -224,6 +224,12 @@ change the default without having to pass flags every time.
 | `UTAZ_DEFAULT_DIR_MODE` | `auto` | Host directory policy: `auto` (only when the archive has no single top-level directory), `always` or `never` |
 | `UTAZ_DEFAULT_IGNORE_CASE` | `0` | Set to `1` to match archive extensions case-insensitively (`.ZIP`, `.Tar.GZ`). Per call: `utaz -i` / `utaz -s` |
 
+**`[debug]`** — `settrace`
+
+| Key | Default | Description |
+| --- | --- | --- |
+| `SETTRACE_DEFAULT_ENABLED` | `0` | Set to `1` to activate the error trace (`settrace --on`) at the startup of every interactive shell |
+
 **`[filefct]`** — file utilities
 
 | Key | Default | Description |