没有文件的Diff

Question

是否可以在没有物理文件的情况下使用“diff”工具？像这样：

diff "hello" "hell"

Answer 1

您可以使用特殊文件名-：

将标准输入与文件区分开来

# diff the contents of the file 'some-file' with the string "foobar"
echo foobar | diff - some-file

使用bash，您还可以使用匿名命名管道（有点用词不当）来区分两个管道：

# diff the string "foo" with the string "baz"
diff <(echo foo) <(echo baz)

另见How can you diff two pipelines with bash?。