没有文件的区别

Question

是否有可能在没有物理文件的情况下使用“diff”工具？事情是这样的：

diff "hello" "hell" 

Answer 1

您可以通过使用特殊的文件名- diff的标准输入与文件：

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

使用bash，你也可以使用匿名命名管道（有点用词不当）以区分两条管道：

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

另请参阅How can you diff two pipelines with bash?。