實用Shell代碼工具記錄

1. 清空檔案

cat /dev/null > file.name

2. 實作輸入不提示代碼

#! /bin/sh

printf “enter your password:”

stty –echo

read password < /dev/tty

printf “\nenter again:”

read password2 < /dev/tty

stty echo

printf “\n”

echo “password 1 is : $password”

echo “password 2 is : $password2”