Github user JonZeolla commented on a diff in the pull request:

    https://github.com/apache/incubator-metron/pull/429#discussion_r98674950
  
    --- Diff: site-book/bin/generate-md.sh ---
    @@ -190,7 +190,13 @@ cd site-book/src/site/markdown
     # Rewrite hrefs for resource references, using table provided by 
Maintainers
     for (( i=0; i<${#HREF_REWRITE_LIST[@]} ; i+=2 )) ; do
         echo rewriting href in "${HREF_REWRITE_LIST[$i]}" : 
"${HREF_REWRITE_LIST[ $(( i + 1 )) ]}"
    -    sed -i '' -e "${HREF_REWRITE_LIST[ $(( i + 1 )) ]}" 
"${HREF_REWRITE_LIST[$i]}"
    +    if [[ "$OSTYPE" =~ "darwin" ]] ; then
    +        # Macs need an argument after -i option 
    +        sed -i '' -e "${HREF_REWRITE_LIST[ $(( i + 1 )) ]}" 
"${HREF_REWRITE_LIST[$i]}"
    +    else
    --- End diff --
    
    I would suggest handling this slightly more explicitly.  My two thoughts 
are:
    1.  Approach it similar to 
[here](https://github.com/anandsubbu/incubator-metron/blob/dc3fa9739bad53da7931d992cdfd499abba5387d/metron-deployment/scripts/platform-info.sh#L68),
 using a `case "${OSTYPE}"` to watch `darwin*` and `linux*`, and then a `*)` 
that alerts the user.
    1. By adding an elif for either `"${OSTYPE}" == linux*` or `"${OSTYPE}" =~ 
"linux"`, and then an `else` that alerts the user.


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