bash - 如何判断Bash中是否不存在常规文件？(How do I tell if a regular file does not exist in Bash?)

Question

I've used the following script to see if a file exists:

(我使用以下脚本查看文件是否存在：)

#!/bin/bash

FILE=$1     
if [ -f $FILE ]; then
   echo "File $FILE exists."
else
   echo "File $FILE does not exist."
fi

What's the correct syntax to use if I only want to check if the file does not exist?

(如果我只想检查文件是否不存在，使用的正确语法是什么？)

#!/bin/bash

FILE=$1     
if [ $FILE does not exist ]; then
   echo "File $FILE does not exist."
fi

  ask by Bill the Lizard translate from so

Answer 1

The test command ( [ here) has a "not" logical operator which is the exclamation point (similar to many other languages).

(测试命令（ [这里）有一个“非”逻辑运算符，它是感叹号（类似于许多其他语言）。)

Try this:

(尝试这个：)

if [ ! -f /tmp/foo.txt ]; then
    echo "File not found!"
fi