diff --git a/test/.env b/test/.env
index 23b28816..e61b722c 100644
--- a/test/.env
+++ b/test/.env
@@ -10,9 +10,17 @@ envdir="$HOME/.infix/venv"
 qeneth="$testdir/qeneth/qeneth"
 runners="podman docker"
 
+#
+# Interactive prompt in 'make test-sh'
+#
 build_ps1()
 {
-    echo "\e[1m\$(date \"+%H:%M:%S\") \h$1\e[0m:\W # "
+    local time="\[\e[1;32m\]"    # Bold green for time
+    local host="\[\e[1;34m\]"    # Bold blue for hostname
+    local dir="\[\e[1;33m\]"     # Bold yellow for working directory
+    local reset="\[\e[0m\]"      # Reset color
+
+    printf "${time}\$(date "+%%H:%%M:%%S") ${host}\h$1${reset}:${dir}\W${reset} # "
 }
 
 #
@@ -21,8 +29,8 @@ build_ps1()
 runner()
 {
     for r in $runners; do
-	which $r >/dev/null && {
-	    echo $r
+	which "$r" >/dev/null && {
+	    echo "$r"
 	    return
 	}
     done