From d56fbaa7e89b011e54428c17d5d313c47d648f80 Mon Sep 17 00:00:00 2001
From: Ali Mohammad Pur <ali.mpfard@gmail.com>
Date: Thu, 16 Feb 2023 21:36:52 +0330
Subject: [PATCH] Shell: Allow underscores in normal expansion names

---
 Userland/Shell/PosixLexer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Shell/PosixLexer.cpp b/Userland/Shell/PosixLexer.cpp
index 776856a8a5..4806d350fc 100644
--- a/Userland/Shell/PosixLexer.cpp
+++ b/Userland/Shell/PosixLexer.cpp
@@ -773,7 +773,7 @@ Lexer::ReductionResult Lexer::reduce_parameter_expansion()
     }
 
     auto next = m_lexer.peek();
-    if (is_ascii_alphanumeric(next)) {
+    if (is_ascii_alphanumeric(next) || next == '_') {
         m_state.buffer.append(consume());
         expansion.parameter.append(next);
         expansion.range.length = m_state.position.end_offset - expansion.range.start - m_state.position.start_offset;