Re: How to keep the archive involatile if the members are involatile?

[Dave Korn <dave dot korn dot cygwin at googlemail dot com>]

Pan ruochen wrote:

> So I think there is some option for ar to keep the archive unchanged
> if the members are not changed.
> But I can't find it in the manual.

  If you're using pretty recent binutils (the feature was only added back in
March), you have the new "deterministic archive" option available:

`D'
     Operate in _deterministic_ mode.  When adding files and the archive
     index use zero for UIDs, GIDs, timestamps, and use consistent file
     modes for all files.  When this option is used, if `ar' is used
     with identical options and identical input files, multiple runs
     will create identical output files regardless of the input files'
     owners, groups, file modes, or modification times.

    cheers,
      DaveK