From f3078bb65a485eee8280fac4ddb8021ac0f2bea6 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 30 Jul 2026 01:45:27 +0000
Subject: [PATCH 1/3] Initial plan


From 2abb1ef5f007e53eea46325f4034e802046513db Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 30 Jul 2026 01:48:56 +0000
Subject: [PATCH 2/3] fix: standalone install script should not add to shell
 config on re-run

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>
---
 ...tandalone-skip-shell-rerun-2026-7-30-1-48-14.md |  7 +++++++
 packages/standalone/install.sh                     | 14 +++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 .chronus/changes/standalone-skip-shell-rerun-2026-7-30-1-48-14.md

diff --git a/.chronus/changes/standalone-skip-shell-rerun-2026-7-30-1-48-14.md b/.chronus/changes/standalone-skip-shell-rerun-2026-7-30-1-48-14.md
new file mode 100644
index 00000000000..fe489bff5d2
--- /dev/null
+++ b/.chronus/changes/standalone-skip-shell-rerun-2026-7-30-1-48-14.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/standalone-cli"
+---
+
+Fix install script adding duplicate PATH entries to shell config files (`.bashrc`, `.zshrc`, etc.) on subsequent runs. The script now detects if TypeSpec is already configured and skips the shell update. Also fix `--skip-shell` flag which was using an inconsistent variable name and had no effect.
diff --git a/packages/standalone/install.sh b/packages/standalone/install.sh
index 71477fd60e9..ef75da25042 100755
--- a/packages/standalone/install.sh
+++ b/packages/standalone/install.sh
@@ -95,7 +95,7 @@ parse_args() {
       #   shift # past value
       #   ;;
       -s | --skip-shell)
-        SKIP_SHELL="true"
+        skip_shell="true"
         shift # past argument
         ;;
       --version)
@@ -188,6 +188,10 @@ setup_shell() {
   if [ "$CURRENT_SHELL" = "zsh" ]; then
     CONF_FILE=${ZDOTDIR:-$HOME}/.zshrc
     ensure_containing_dir_exists "$CONF_FILE"
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+      info "TypeSpec path already configured in $CONF_FILE, skipping."
+      return
+    fi
     echo "Installing for Zsh. Appending the following to $CONF_FILE:"
     {
       echo ''
@@ -201,6 +205,10 @@ setup_shell() {
   elif [ "$CURRENT_SHELL" = "fish" ]; then
     CONF_FILE=$HOME/.config/fish/conf.d/tsp.fish
     ensure_containing_dir_exists "$CONF_FILE"
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+      info "TypeSpec path already configured in $CONF_FILE, skipping."
+      return
+    fi
     echo "Installing for Fish. Appending the following to $CONF_FILE:"
     {
       echo ''
@@ -218,6 +226,10 @@ setup_shell() {
       CONF_FILE=$HOME/.bashrc
     fi
     ensure_containing_dir_exists "$CONF_FILE"
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+      info "TypeSpec path already configured in $CONF_FILE, skipping."
+      return
+    fi
     echo "Installing for Bash. Appending the following to $CONF_FILE:"
     {
       echo ''

From 7878d99191172e0cb2c8d6faf7c9c292b3553614 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 30 Jul 2026 11:33:08 +0000
Subject: [PATCH 3/3] style: run formatter on install.sh

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>
---
 packages/standalone/install.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/standalone/install.sh b/packages/standalone/install.sh
index ef75da25042..eb26cb4145e 100755
--- a/packages/standalone/install.sh
+++ b/packages/standalone/install.sh
@@ -188,7 +188,7 @@ setup_shell() {
   if [ "$CURRENT_SHELL" = "zsh" ]; then
     CONF_FILE=${ZDOTDIR:-$HOME}/.zshrc
     ensure_containing_dir_exists "$CONF_FILE"
-    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2> /dev/null; then
       info "TypeSpec path already configured in $CONF_FILE, skipping."
       return
     fi
@@ -205,7 +205,7 @@ setup_shell() {
   elif [ "$CURRENT_SHELL" = "fish" ]; then
     CONF_FILE=$HOME/.config/fish/conf.d/tsp.fish
     ensure_containing_dir_exists "$CONF_FILE"
-    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2> /dev/null; then
       info "TypeSpec path already configured in $CONF_FILE, skipping."
       return
     fi
@@ -226,7 +226,7 @@ setup_shell() {
       CONF_FILE=$HOME/.bashrc
     fi
     ensure_containing_dir_exists "$CONF_FILE"
-    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2>/dev/null; then
+    if grep -qF "TYPESPEC_PATH" "$CONF_FILE" 2> /dev/null; then
       info "TypeSpec path already configured in $CONF_FILE, skipping."
       return
     fi