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Why does git diff not work with process substitution?
$ echo hallo > hallo $ echo holla > holla $ git diff hallo holla # works $ git diff hallo <(cat holla) # works not diff --git a/hallo b/hallo deleted file mode 100644 index 4cf5aa5..0000000 --- a/hallo +++ /dev/null @@ -1 +0,0 @@ -hallo diff --git a/dev/fd/63 b/dev/fd/63 new file mode 120000 index 0000000..864a6ca` Same with git diff --no-index.
It works with plain diff. cat is only a trivial example, can be replaced by a non-trivial sed expression.
Workaround:
$ cat holla | git diff hallo - # works But it will not work if both arguments should be affected by process substitution, like described in many examples for diff and process substitution.
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In answer to the original question, git diff isn't showing anything because you have a brand new directory, with a newly added file, but there are zero changes in the file for git diff to show. git status is showing that you added a new file, but git diff is for showing changes within files.
Diffing is a function that takes two input data sets and outputs the changes between them. git diff is a multi-use Git command that when executed runs a diff function on Git data sources. These data sources can be commits, branches, files and more.
When viewing a combined diff, if the two files you're comparing have a line that's different from what they were merged into, you will see the ++ to represent: one line that was added does not appear in either file1 or file2.
The git diff command returns a list of all the changes in all the files between our last commit and our current repository. If you want to retrieve the changes made to a specific file in a repository, you can specify that file as a third parameter.
git diff does not work with process substitution because a patch that added handling of process substitution was ignored.
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