check

var FlagsHelp = strings.ReplaceAll(`
If you supply the |--one-way| flag, it will only check that files in
the source match the files in the destination, not the other way
around. This means that extra files in the destination that are not in
the source will not be detected.

The |--differ|, |--missing-on-dst|, |--missing-on-src|, |--match|
and |--error| flags write paths, one per line, to the file name (or
stdout if it is |-|) supplied. What they write is described in the
help below. For example |--differ| will write all paths which are
present on both the source and destination but different.

The |--combined| flag will write a file (or stdout) which contains all
file paths with a symbol and then a space and then the path to tell
you what happened to it. These are reminiscent of diff files.

- |= path| means path was found in source and destination and was identical
- |- path| means path was missing on the source, so only in the destination
- |+ path| means path was missing on the destination, so only in the source
- |* path| means path was present in source and destination but different.
- |! path| means there was an error reading or hashing the source or dest.

The default number of parallel checks is 8. See the [--checkers=N](/docs/#checkers-n)
option for more information.
`, "|", "`")