[Bug 12721] New: grep does not implement -e pattern_lists currently

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=12721

            Bug ID: 12721
           Summary: grep does not implement -e pattern_lists currently
           Product: Busybox
           Version: 1.31.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: bhcopnmeha at big6w.anonbox.net
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

>From `grep(1p)`:

  The pattern_list's value shall consist of one or more patterns separated by
<newline> characters;

Consider the following invocation:

  printf "foo\nbar\nbaz\n" | grep -Fv -e "$(printf "foo\nbar\n")"

In accordance with the POSIX man page this should output the following:

  baz

This is what GNU grep (for instance) outputs. The busybox implementation
outputs:

  foo
  bar
  baz

Instead. Looking at the implementation this is due to the fact that busybox
does not check for newline in patterns when the -e option is given.

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