Updating web.xml using shell script to change the param-value

Question

I have below entry in web.xml

<context-param>
  <param-name>oracle.adf.view.rich.automation.ENABLED</param-name>
  <param-value>false</param-value>
</context-param>

I am doing some repackaging work using shell script and want to change the value from 'false' to 'true' only for the given param-name. How can I do it using sed/awk command? Note that there are multiple param-name and param-value entries with 'false' values which shouldn't change alongwith.

score 1 · Answer 1 · answered Nov 21 '13 at 20:23

1

awk -v tgt='oracle.adf.view.rich.automation.ENABLED' '
    found { sub(/false/,"true"); found=0 }
    { found = index($0,"<param-name>" tgt "</param-name>" }
' file

answered Nov 21 '13 at 20:23

Ed Morton

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getting syntax error - awk: found { sub(/false/,"true"); found=0 } { found = index($0,"" tgt "" } ^ syntax error – dganesh2002 Nov 21 '13 at 21:12
OK, so fix the syntax error. I'm sure if you put a minutes thought into it you'd see what the problem is. It's just another programming language, it's not magic. – Ed Morton Nov 22 '13 at 00:58

score 1 · Answer 2 · edited May 23 '17 at 12:14

1

Don't parse XML with regex !

Using xmlstarlet & xpath (a proper XML parser):

 xmlstarlet edit -L -u "/context-param/param-value" -v 'true' file.xml

To match the Nth element, you can adapt it a bit (starting from 1) :

 xmlstarlet edit -L -u "/context-param[10]/param-value[5]" -v 'true' file.xml

edited May 23 '17 at 12:14

Community

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1

answered Nov 21 '13 at 20:26

Gilles Quénot

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Looks like I need to install xmlstartlet for this which is not possible for me. Further it uses the count which may change in future and thats a risk.. – dganesh2002 Nov 21 '13 at 21:18
If `xmlstarlet` is not installed, maybe `perl` is ? – Gilles Quénot Nov 21 '13 at 21:19

score 0 · Answer 3 · answered Nov 22 '13 at 07:24

sed "/<context-param>/,/<\/context-param>/ {
   /<context-param>/ h
   /<context-param>/ !H
   /<\/context-param>/ {
     x;s/<param-name>oracle.adf.view.rich.automation.ENABLED<\/param-name>/&/
     t chg
     b
:chg
     s/<param-value>false</<param-value>true</
     }" web.xml

treat section context-param, load in buffer, check if param-name is the good one and change false to true if iti is the case

Updating web.xml using shell script to change the param-value

3 Answers3