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Full Discussion: Tar extract: remap uid gid ?
Top Forums Shell Programming and Scripting Tar extract: remap uid gid ? Post 302953842 by Don Cragun on Wednesday 2nd of September 2015 03:45:07 AM
Old 09-02-2015
If you are trying to extract all files from a tar archive with a given user ID (or user name) and group ID (or group name) you could use:
Code:
pax -r -ouid=UID,gid=GID -f tarfile
                     or
pax -r -ouname=USER,gname=GROUP -f tarfile

where UID and GID are the desired user and group IDs and USER and GROUP are the desired user and group names.

But, if the desire is to map several different users and/or groups in the archive to different users and/or groups as they are extracted, I don't know of any standard way to do it.

You could, however, use list mode on the archive to get a list of files with the corresponding user and group recorded in the archive, create lists of files for a given user/group, and then extract files for a given user from the archive with a specified replacement for that user/group.

If you have a BSD version of pax, you could skip the list creation step and just use -G and -U options to specify the group ID(s) or name(s) and user ID(s) or name(s) of files to be extracted on that pass (but you can still only set the user and group to one value for all files extracted on a single invocation).
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LEARN ABOUT X11R4

group

GROUP(5)                                                     Linux Programmer's Manual                                                    GROUP(5)

NAME

       group - user group file

DESCRIPTION

       The /etc/group file is a text file that defines the groups on the system.  There is one entry per line, with the following format:

           group_name:password:GID:user_list

       The fields are as follows:

       group_name  the name of the group.

       password    the (encrypted) group password.  If this field is empty, no password is needed.

       GID         the numeric group ID.

       user_list   a list of the usernames that are members of this group, separated by commas.

FILES

       /etc/group

BUGS

       As the 4.2BSD initgroups(3) man page says: no one seems to keep /etc/group up-to-date.

SEE ALSO

       chgrp(1), gpasswd(1), groups(1), login(1), newgrp(1), sg(1), getgrent(3), getgrnam(3), gshadow(5), passwd(5)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux                                                               2016-10-08                                                            GROUP(5)
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