gnu tar checkpoint variable expansion

Matthew Seaman m.seaman at
Wed Oct 21 13:55:44 UTC 2009

Jay Hall wrote:
> Ladies and Gentlemen,
> I am working with gnu tar checkpoints this morning can cannot seem to 
> get variables to expand properly when they are passed as part of a 
> checkpoint action.  Following is how I am using gnu tar
> DIR="/home/test"
> WHATTOBACKUP="/home/somedir"
> /usr/local/gtar-1.22/bin/tar -cf - ${WHATTOBACKUP} \
>     --checkpoint-action='echo=Checkpoint #%u' 
> --checkpoint-action='exec=/usr/local/scripts/ ${DIR}'
> When I use ${DIR} as a parameter, it is not sent to the 
> check_disk_usage_script.  However, if I replace ${DIR} with /home/test, 
> everything works fine.
> Any suggestions anyone has would be greatly appreciated.

That's fairly basic shell syntax.  Use "double quotes" on any string where
you want variable interpolation.



Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP:     Ramsgate
                                                  Kent, CT11 9PW

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