···

       
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usage() {

     

       
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    cat <<EOF

     

       
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-
       
usage: nix-diff.sh [-h] [-p profile | -s] [range]

     

       
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+
       
usage: nix-diff.sh [-h | [-p profile | -s] [-q] [-l] [range]]

     

       
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-h:         print this message before exiting

     

       
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-q:         list the derivations installed in the parent generation

     

       
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-l:         diff every available intermediate generation between parent and