沒有文件的區別

Question

是否有可能在沒有物理文件的情況下使用「diff」工具？事情是這樣的：

diff "hello" "hell" 

Answer 1

您可以通過使用特殊的文件名- diff的標準輸入與文件：

# 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（有點用詞不當）以區分兩條管道：

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

另請參閱How can you diff two pipelines with bash?。