[Bug 219080] "sort" command -o output to overwrite the input file, new file permission neither the input file one nor umask conf

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219080

            Bug ID: 219080
           Summary: "sort" command -o output to overwrite the input file,
                    new file permission neither the input file one nor
                    umask conf
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ffp.howard at gmail.com

Given a txt/csv file named 'a',

-rw-r--r--   1 howie  howie  18 May  5 16:26 a

$ sort -k 1 -r a -o b
$ ls -la
total 37
drwxr-xr-x   2 howie  howie   4 May  5 16:33 .
drwxr-xr-x  10 howie  howie  12 May  5 16:26 ..
-rw-------   1 howie  howie  18 May  5 16:33 a
-rw-r--r--   1 howie  howie  18 May  5 16:32 b


That's ok! Now, let's use sort to 'update' the input file, note the file
permission of 'a'

$ sort -k 1 -r a --output a
$ls -la
total 37
drwxr-xr-x   2 howie  howie   4 May  5 16:47 .
drwxr-xr-x  10 howie  howie  12 May  5 16:26 ..
-rw-------   1 howie  howie  18 May  5 16:47 a
-rw-r--r--   1 howie  howie  18 May  5 16:32 b

$ chmod a+r a
$ ls -la
total 37
drwxr-xr-x   2 howie  howie   4 May  5 16:47 .
drwxr-xr-x  10 howie  howie  12 May  5 16:26 ..
-rw-r--r--   1 howie  howie  18 May  5 16:47 a
-rw-r--r--   1 howie  howie  18 May  5 16:32 b

$ sort -k 1 -r a --output a
$ ls -la
total 37
drwxr-xr-x   2 howie  howie   4 May  5 16:48 .
drwxr-xr-x  10 howie  howie  12 May  5 16:26 ..
-rw-------   1 howie  howie  18 May  5 16:48 a
-rw-r--r--   1 howie  howie  18 May  5 16:32 b

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