Compare outputs of commands with Diff

# Compare outputs of commands with Diff

Comparing two files with the `diff` utility is an easy task

``````diff <file1> <file2>
``````

But if you want to compare the output of two commands without temporarily saving it to a file, it's a bit more complicated, because diff needs two inputs:

``````diff -u <(echo output1) <(echo output2)
--- /proc/self/fd/11    2013-07-29 10:59:06.037561642 +0200
+++ /proc/self/fd/12    2013-07-29 10:59:06.037561642 +0200
@@ -1 +1 @@
-output1
+output2
``````

As we can see, the shell creates two file-descriptors from the `stdin` input.

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