relative_file_names_in_a_tar_archive []

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=== Relative file names in a tar archive ===
==== Problem ====
If we tar the following directory
<code>
% tree --charset=unicode /tmp/expt
/tmp/expt
`-- insurance
    |-- auto.txt
    |-- condo.txt
    `-- rv.txt

1 directory, 3 files
</code>
using
<code>
% tar czvf insurance.tgz /tmp/expt/insurance 
tar: Removing leading `/' from member names
/tmp/expt/insurance/
/tmp/expt/insurance/auto.txt
/tmp/expt/insurance/rv.txt
/tmp/expt/insurance/condo.txt
</code>
then the file names in the .tgz contain the whole path releative to '/'.
<code>
% tar tzvf insurance.tgz                   
drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/auto.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/rv.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 tmp/expt/insurance/condo.txt
</code>
But I want the paths to be relative to the 'insurance' directory. Something like
<code>
drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 insurance/
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/auto.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/rv.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/condo.txt
</code>

==== Solution ====
Use the -C option while creating the tar archive.
<code>
% tar czvf insurance2.tgz -C /tmp/expt insurance
insurance/
insurance/auto.txt
insurance/rv.txt
insurance/condo.txt
</code>
Test the new archive.
<code>
% tar tzvf insurance2.tgz                       
drwxr-xr-x rajulocal/rajulocal 0 2020-12-04 10:25 insurance/
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/auto.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/rv.txt
-rw-r--r-- rajulocal/rajulocal 0 2020-12-04 10:25 insurance/condo.txt
</code>
==== How it works ====
From the man page
<code>
% man tar
...
       -C, --directory=DIR
              Change  to DIR before performing any operations.  This option is order-sensitive, i.e. it affects all
              options that follow.
</code>

==== Miscellaneous ====
Tested on Debian Buster using
<code>
% tar --version
tar (GNU tar) 1.30
</code>

tags | extract files relative to a directory