Preserving SGID with tar/gtar

[Chern Jian Leaw]

HI,

I would like to transfer about 50GB of filesystems using a S-DLT tape.
From the man pages of tar/gtar, there does not seem to have any options of preserving the SGID or SUID.

Are there any other ways of preserving the SGID and SUID of these filesystem, besides gtar or tar for such data transfer?

If a script is required to automate such task, could someone kindly show how it's done?

Thanks.

[John Carr_2]

Hi

tar -p

this will preseve file ownerships and cause files files to be restored to there original modes and ownerships.

you could also consider using cpio to do this which is quicker than tar.

cheers
John.

[Stefan Farrelly]

By default tar restores SGID and SUID. Try it. Ive justed tested it, works fine. No special options needed.

[John Carr_2]

Hi

If you have backed up your files with tar and when restoring them you encounter the SGID and SUID to be lost it may be because you are not root. System protections prevent the ordinary user from executing chown and chmod resulting in the error being ignored and the ownership being set to that of the restoring process. The SUID , SGID and stick bit information are restored as allowed by protections defined by chmod if the chown operation was successful.

cheers
John.

[Manoj Misra]

Hi,

Use cpio, this is quicker and safer.
Regards
Manoj