仅当文件存在于 shell 脚本中时才移动

Question

As part of a backup script I want to call mv on a file to rename it:

mv example.txt example2.txt

If the file doesn't exist, I am receiving the error:

mv: cannot stat ‘example.txt’: No such file or directory

How do I call the mv only if the file already exists?

I don't really want to redirect stderr to dev/null as I'd quite like to keep any other errors that occur.

Answer 1

即使找不到文件，这一行也会成功返回：

[ ! -f src ] || mv src dest

Answer 2

一内胆：

[ -f old ] && mv old nu

Answer 3

You should test if the file exists

if [ -f blah ]; then
   mv blah destination
fi