Replace delimited block of text in file with the contents of another file

Posted by rmarimon on Stack Overflow See other posts from Stack Overflow or by rmarimon
Published on 2010-04-23T15:11:16Z Indexed on 2010/04/23 15:13 UTC
Read the original article Hit count: 322

Filed under:

sed

|

awk

|

bash

|

shell

|

scripting

I need to write a simple script to replace a block of text in a configuration file with the contents of another file.

Let's assume with have the following simplified files:

server.xml

<?xml version='1.0' encoding='UTF-8'?>
<Server port="8005" shutdown="SHUTDOWN">
  <Service name="Catalina">
    <Connector port="80" protocol="HTTP/1.1"/>
    <Engine name="Catalina" defaultHost="localhost">
      <!-- BEGIN realm -->
        <sometags/>
        <sometags/>
      <!-- END realm -->
      <Host name="localhost" appBase="webapps"/>
    </Engine>
  </Service>
</Server>

realm.xml

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
       resourceName="UserDatabase"/>

I want to run a script and have realm.xml replace the contents between the  and  lines. If realm.xml changes then whenever the script is run again it will replace the lines again with the new contents of realm.xml. This is intended to be run in /etc/init.d/tomcat on startup of the service on multiple installations on which the realm is going to be different.

I'm not so sure how can I do this simply with awk or sed.

© Stack Overflow or respective owner

Related posts about sed

sed + RE , want to ignore remarked line using sed

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to replace the a string with the word string as the following example down , but if a string exist also after comment then a string will replaced too In which way I can add to the sed command the irregular exp that ignore from the #. [root@localhost tmp]# more test a b aa bb #a #b #aa #bb [root@localhost… >>> More
script to search and replace deprecated functions

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am using the following script to search and replace the deprecated functions in a file with the newer ones. 5 for strFile in `ls deprecated_functions_search_and_replace.txt ` 6 do 7 sed "s/ereg_replace[^\(]*(\([^,]*\),/preg_replace\1('#'.\2.'#',/g" $strFile > temp_file 8 … >>> More
Footer not stretching 100% when horizontally scrolled

as seen on Pro Webmasters - Search for 'Pro Webmasters'
I have a footer which is set to 100% width, but if i size the window smaller so a horizontal scrollbar appears, using the scrollbar shows whitespace to the right of the footer ... its not spanned 100% of the page, just the viewport. <!doctype html> <html lang="en" class="no-js"> <head> … >>> More
What does this regex mean and why

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
$ sed "s/\(^[a-z,0-9]*\)\(.*\)\( [a-z,0-9]*$\)/\1\2 \1/g" desired_file_name I apreciate it even if you only explain part of it or at lest structure it with words as in s\alphanumerical_at_start\something\alphanumerical_at_end\something_else\global Could someone explain what that means, why and… >>> More
Sed problem in a Bash script

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Hello there. I'm having a problem using the sed command . I'm trying to write a bash script that does the following : search for the line that contain :@ then save the line that contained :@ and replace it with new line as in the following: #! /bin/bash echo "Please enter the ip address… >>> More

Related posts about awk

problem with awk script

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, when I call my awk script, I keep getting an error : sam@sam-laptop:~/shell/td4$ awk -f agenda.awk -- -n Robert agenda.txt awk: agenda.awk:6: printf "Hello" awk: agenda.awk:6: ^ syntax error the script contains this : #!/usr/bin/awk BEGIN { } printf "Hello" END { } Thank you >>> More
Awk to grab colo(u)r codes from CSS files aka School me in Awk

as seen on Stack Overflow - Search for 'Stack Overflow'
Nice and (hopefully) easy. I am trying to work out how to grab the variable #XXX from a text file (css file) containing strings like hr { margin: 18px 0 17px; border-color: #ccc; } h1 a:hover, h2 a:hover, h3 a:hover { color: #001100; } Which I would like to return as ccc 777 The… >>> More
Parsing the output of "uptime" with bash

as seen on Super User - Search for 'Super User'
I would like to save the output of the uptime command into a csv file in a Bash script. Since the uptime command has different output formats based on the time since the last reboot I came up with a pretty heavy solution based on case, but there is surely a more elegant way of doing this. uptime… >>> More
AWK scripting :How to remove Field separator using awk

as seen on Stack Overflow - Search for 'Stack Overflow'
Need the following output ONGC044 ONGC043 ONGC042 ONGC041 ONGC046 ONGC047 from this input Medium Label Medium ID Free Blocks =============================================================================== [ONGC044] ECCPRDDB_FS_43 ac100076:4aed9b39:44f0:0001… >>> More
sort associative array in awk - help?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I have an associative array in awk that gets populated like this... chr_count[$3]++ When I try to print my chr_counts I use this: for (i in chr_count) { print i,":",chr_count[i]; } But not surprisingly, the order of i is not sorted in any way. Is there an easy way to iterate over… >>> More