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An exclamation mark followed by space in the beginning of a pipeline will negate the final exit code of the pipeline.
Here's an example in Bash. Echoing $? will print out the exit code of the previous command (which is also an echo in this case).
$ echo OpenStreetMap is the best map
OpenStreetMap is the best map
$ echo $?
0
$ ! echo OpenStreetMap is meh
OpenStreetMap is meh
$ echo $?
1
This is a Posix thing.
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