Check the total content size of a tar gz file

Question

How can I extract the size of the total uncompressed file data in a .tar.gz file from command line?

Answer 1

I'm finding everything sites in the web, and don't resolve this problem the get size when file size is bigger of 4GB.

first, which is most faster?

[oracle@base tmp]$ time zcat oracle.20180303.030001.dmp.tar.gz | wc -c
    6667028480

    real    0m45.761s
    user    0m43.203s
    sys     0m5.185s

[oracle@base tmp]$ time gzip -dc oracle.20180303.030001.dmp.tar.gz | wc -c
    6667028480

    real    0m45.335s
    user    0m42.781s
    sys     0m5.153s

[oracle@base tmp]$ time tar -tvf oracle.20180303.030001.dmp.tar.gz
    -rw-r--r-- oracle/oinstall 111828 2018-03-03 03:05 oracle.20180303.030001.log
    -rw-r----- oracle/oinstall 6666911744 2018-03-03 03:05 oracle.20180303.030001.dmp

    real    0m46.669s
    user    0m44.347s
    sys     0m4.981s

definitely, tar -xvf is the most faster, but ¿how to cancel executions after get header?

my solution is this:

[oracle@base tmp]$  time echo $(timeout --signal=SIGINT 1s tar -tvf oracle.20180303.030001.dmp.tar.gz | awk '{print $3}') | grep -o '[[:digit:]]*' | awk '{ sum += $1 } END { print sum }'
    6667023572

    real    0m1.005s
    user    0m0.013s
    sys     0m0.066s