Shell Programming and Scripting

Results vary. I used a pretty rough but effective regex. Did you use an extended regex without telling sed?:

Code:

echo 'first block
<filter>
        <filter-name>MyRegEx</filter-name>
        <filter-class>MyRegExblablabla</filter-class>
    </filter>
second block
<filter-mapping>
        <filter-name>MyRegEx</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
' | sed '
  /<filter[-maping]*[ >]/{
    :loop
    /<\/filter[-maping]*>/!{
      $d
      N
      b loop
     }
    s/<filter[-maping]*[ >].*<\/filter[-maping]*>/<!--\
&\
-->/
   }
 '
first block
<!--
<filter>
        <filter-name>MyRegEx</filter-name>
        <filter-class>MyRegExblablabla</filter-class>
    </filter>
-->
second block
<!--
<filter-mapping>
        <filter-name>MyRegEx</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
-->

PS: For variant element regex, the second test, element not closed, s/b a back referencer, \(whatever\) I opened with, have I closed with that = \1 ?:

Code:

/<\(regex-name\)[ >].*<\/\1>/!{

is there a way with sed to removed more than one set of lines in one line?

so i mean

sed ${firstElem},${lastIndex}d web.xml > web1.xml

this will delete lines between ${firstElem},${lastIndex}

i want in the same line to do somethinkg like this (doesn't work so far)


sed ${firstElem},${lastIndex}d ; ${secondElem},${lastIndex1}d web.xml > web1.xml


at the same time delete lines between ${firstElem},${lastIndex} and ${secondElem},${lastIndex1}d

if i don't do this in one line.. indexes for the second set change.. and i need to grep for them again.. so it would be really good if i could delete the two sets simulatiously..

thanks a lot

---------- Post updated at 06:29 PM ---------- Previous update was at 06:28 PM ----------



trying a different way.. now..


is there a way with sed to removed more than one set of lines in one line?

so i mean

sed ${firstElem},${lastIndex}d web.xml > web1.xml

this will delete lines between ${firstElem},${lastIndex}

i want in the same line to do somethinkg like this (doesn't work so far)


sed ${firstElem},${lastIndex}d ; ${secondElem},${lastIndex1}d web.xml > web1.xml


at the same time delete lines between ${firstElem},${lastIndex} and ${secondElem},${lastIndex1}d

if i don't do this in one line.. indexes for the second set change.. and i need to grep for them again.. so it would be really good if i could delete the two sets simulatiously..

thanks a lot

Well, sed will happily delete ranges with "/regex1/,/regex2/d", and you can do that as many times as you want (as long as one does not start within another).

Your xml is pretty well behaved, but I often normalize it so every element starts at the beginning of a line. That simplified subsequent parsing, so you do not need to worry about one line elements except like <xxx yyy="zzz" www="xxx" />. You could expand that, so it is entirely simply normal.

I often pile sed on sed in a pipeline. The sort of sed that loops and does N does not mix easily with those that do simple line filtering, so why not, pipes are free. You can even embed each sed command in an executable script file that begins in the line "#!/usr/bin/sed -f" (your path may vary) and execute the scripts.

Code:

gawk 'BEGIN{RS="</filter>|</filter-mapping>"}
/>MyRegEx</{ $0="<!--\n"$0RT"\n-->" }1 ' file

If you use regex not line #, then line numbering is not an issue. Consider doing it like "diff -e" output: put the changes in reverse line number order.

sed numbers lines at input, so the numbers do not change on one pass, in any case.