Use read -s if it is supported.

lib/read.sh

@@ -1,13 +1,27 @@
-if [ "$1" = "noechoback" ]; then
+silentRead() {
+  # `typeset` doesn't work in `func()` of ksh.
+  # `function fnc` for local-var of ksh is not compatible.
+  # Therefore, `_input` is not local-var on ksh.
+  local _input="" 2>/dev/null || typeset _input=""
   stty --file=/dev/tty -echo echonl 2>/dev/null || \
     stty -F /dev/tty -echo echonl 2>/dev/null || \
     stty -f /dev/tty -echo echonl 2>/dev/null || \
     exit 1
-  IFS= read -r INPUT </dev/tty
+  IFS= read -r _input </dev/tty
   stty --file=/dev/tty echo -echonl 2>/dev/null || \
     stty -F /dev/tty echo -echonl 2>/dev/null || \
     stty -f /dev/tty echo -echonl 2>/dev/null
-  # printf '\n' >/dev/tty
+  printf '%s' "$_input"
+}
+
+if [ "$1" = "noechoback" ]; then
+  # Try `-s` option. *ksh have it that not `--silent`. Therefore, don't try it.
+  if [ -n "$BASH_VERSION" ] || [ -n "$ZSH_VERSION" ]; then
+    IFS= read -rs INPUT </dev/tty 2>/dev/null || INPUT=`silentRead` || exit 1
+    printf '\n' >/dev/tty
+  else
+    INPUT=`silentRead` || exit 1
+  fi
 else
   IFS= read -r INPUT </dev/tty
 fi

package.json

@@ -1,6 +1,6 @@
 {
   "name": "readline-sync",
-  "version": "0.7.1",
+  "version": "0.7.2",
   "title": "readlineSync",
   "description": "Synchronous Readline",
   "keywords": [