Create Signatures and Checksums for Multiple Files at Once

gottasignemall.sh

#!/bin/bash
# needs: apt-get install gnupg parallel


# for mybackup.tar.gz.aa, mybackup.tar.gz.ab, etc.
find . -maxdepth 1 -type f -iname "mybackup.tar.gz.??" | parallel --gnu \
        -j 8 --workdir "$PWD" '
    gpg --armor --detach-sig "{}" ;
    echo -n "$(shasum "{}" | cut -b 1-40)" > "{}.sha" ;
    echo -n "$(md5sum "{}" | cut -b 1-32)" > "{}.md5" ;
'

# using 8 workers, generate signatures and checksums for all found files above.