[Bug 252446] egrep bug with trailing backslash (\)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252446

            Bug ID: 252446
           Summary: egrep bug with trailing backslash (\)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: fernando.valle at eldorado.org.br

Running the test: /usr/tests/usr.bin/du/du_test:H_flag the following failure is
occurring:

stderr:
egrep: trailing backslash (\)

The expression that fails the test is:
egrep -q "[0-9]+\t$(echo $paths1 | tr ' ' "$sep")\n" du.out

I did the test on amd64 and powerpc64(main-c255460-g282381aa5), in both the
same error occurs.

It seems that grep is currently experiencing some problem with a trailing
backslash.

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