linux - shell 脚本中的条件不起作用

Question

我的 shell 程序是:

  testname=methun
  echo "Please enter your name:"
  read username
  if [ "$username" == "$testname"]; then
   age=20
   echo " you are $age years old."
  else
    echo "How old are you?"
    read Age
    if [ "$Age" -le 20]; then
      echo "you are too young."
   else
    if["$Age" -ge 100]; then
      echo " You are old."
    else 
      echo "you are young."
  fi  fi fi

现在，当我运行我的程序时，它能够接受用户输入并显示错误。错误如下:

./filename line linenumber:sysntax error near unexpected token 'then'
./filename line linenumber: 'if["$username" -eq "$testname"]; then'

Answer 1

您缺少一些空格:

#!/bin/bash
testname=methun
echo "Please enter your name:"
read username

if [ "$username" == "$testname" ]; then
  age=20
  echo " you are $age years old."
else
  echo "How old are you?"
  read Age
  if [ "$Age" -le 20 ]; then
    echo "you are too young."
  else
    if [ "$Age" -ge 100 ]; then
      echo " You are old."
    else
      echo "you are young."
    fi
  fi
fi