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  1. or download this
    $ wc -l big1.txt big2.txt big3.txt 
     3515200 big1.txt
    ...
    
    $ ls -lh hash1.db 
    -rw-r--r-- 1 mario mario 330M Feb  7 22:55 hash1.db
    
  2. or download this
    #!/usr/bin/env bash
    # https://perlmonks.org/?node_id=11150229
    ...
    done
    
    exec "$SQLCMND" "$DB" < <(echo "$SQLSCRIPT")
    
  3. or download this
    #!/usr/bin/env bash
    # https://perlmonks.org/?node_id=11150229
    ...
    SQLSCRIPT="$( make_script )"
    
    exec "$SQLCMND" "$DB" < <(echo "$SQLSCRIPT")