Using xmlstarlet, how do I change the value of an element

Question

Using xmlstarlet how can replace the value for all instances of ThreadGroup.num_threads please?

Before

Answer 1

You can du this with xmlstarlet ed -u. Specify an XPath expression and then set the new value with -v:

xmlstarlet ed -u '/ThreadGroup/stringProp[@name="ThreadGroup.num_threads"]' \
                -v 99999 file.xml

(Depending on the rest of your XML file, you may have to modify the XPath expression to be more specific and account for more nesting)

Here's a complete example:

$ cat file.xml

  continue
  
    false
    778
  
  99999
  66
  44
  55
  false
  77
  0


$ xmlstarlet ed -u '/ThreadGroup/stringProp[@name="ThreadGroup.num_threads"]' \
                -v 99999 file.xml


  continue
  
    false
    778
  
  99999
  66
  44
  55
  false
  77
  0