Give initial PS4 value

src/core.rs

@@ -103,6 +103,8 @@ impl ShellCore {
         ignore_signal(Signal::SIGPIPE);
         ignore_signal(Signal::SIGTSTP);
 
+        core.data.set_param("PS4", "+ ");
+
         if unistd::isatty(0) == Ok(true) {
             const V: &'static str = env!("CARGO_PKG_VERSION");
             eprintln!("Rusty Bash (a.k.a. Sushi shell), version {}", V);

src/main.rs

@@ -59,6 +59,10 @@ fn run_signal_check(core: &mut ShellCore) {
 } //thanks: https://dev.to/talzvon/handling-unix-kill-signals-in-rust-55g6
 
 fn read_rc_file(core: &mut ShellCore) {
+    if ! core.data.flags.contains("i") {
+        return;
+    }
+
     let dir = match core.data.get_param("CARGO_MANIFEST_DIR").as_str() {
         "" => core.data.get_param("HOME"),
         s  => s.to_string(),

test/error

@@ -2,3 +2,8 @@
 ./test_script.bash
 ./test_script.bash
 ./test_script.bash
+./test_script.bash
+../test/test_script.bash
+../test/test_script.bash
+./test_script.bash
+./test_script.bash

test/lineno.sush

@@ -1,4 +1,4 @@
-#!/bin/sush -xv
+#!../target/release/sush -xv
 
 echo $0
 echo $1