Emergency UNIX and Linux Support

This doesn't happen. A new file is ALWAYS written and the old file replaced. This is simply the method used by operating systems for "text" files of any sort.

The second problem is that you want to check "if it doesn't exist" and then place it there. Well, you can't really do that in one pass. The best solution is to Put it there and remove any existing ones.

So:

Code:

awk '
   /<key>ExcludeSimpleHostnames</ { s=1; next; } 
   s && /<integer>[0-9]*</integer>/ { s=0; next;} 
   /<key>Proxies</ { p=1 } 
   p && /<\/array>/ {
                print; 
                print "<key>ExcludeSimpleHostnames</key>";
                print "<integer>1</integer>"; 
                p=0; next; } 
    { print; }'

If you want to use the integer value found in this proxy section, you're kind of screwed -- you have to either do backtracking or two passes or create a metastructure of all the data and write it out again to XML. That's because you want the ExcludeSimpleHostnames key to follow the array in the output, but the input, it might occur later.

Code

Code:

sed '<integer>,</integer> {
s/0/1/g
}
' input_file

---------- Post updated at 08:18 AM ---------- Previous update was at 08:16 AM ----------

or more accurte:-

Code:

sed 'ExcludeSimpleHostnames,\/integer {
s/0/1/g
}
' input_file.txt