macのechoをシェルスクリプト内で使う時に -nオプションを使う方法 ref: http://qiita.com/okisanjp/items/7985ddb9b1b00f1617a9

file0.txt

# シェルスクリプト内で以下のように書くと
echo -n "Are you sure you want to exit the server? [y/n] > "

# 実行時
-n Are you sure you want to exit the server? [y/n] >

(´；ω；｀)ｳｯ…

file1.txt

$ whereis echo
/bin/echo

file2.txt

if [ `uname` = "Darwin" ]; then
    /bin/echo -n "Are you sure you want to exit the server? [y/n] > "
  else
    echo -n "Are you sure you want to exit the server? [y/n] > "
fi

file3.txt

#!/bin/sh

file4.txt

#!/bin/bash