how to edit XML using bash script?

Question

1
2

Need to change values 1 and 2 from bash

Answer 1

my $0.02 in python because its on every server you will ever log in to

import sys, xml.etree.ElementTree as ET

data = ""
for line in sys.stdin:
    data += line

tree = ET.fromstring(data)

nodeA = tree.find('.//tag')
nodeB = tree.find('.//tag1')

tmp = nodeA.text
nodeA.text = nodeB.text
nodeB.text = tmp 

print ET.tostring(tree)

this reads from stdin so you can use it like this:

$ echo 'hi!this' | python xml_process.py 
thishi!

EDIT - challenge accepted

Here's a working xmllib implementation (should work back to python 1.6). As I thought it would be more fun to stab my eyes with a fork. The only think I will say about this is it works for the given use case.

import sys, xmllib

class Bag:
    pass

class NodeSwapper(xmllib.XMLParser):
    def __init__(self):
    print 'making a NodeSwapper'
    xmllib.XMLParser.__init__(self)
    self.result = ''
    self.data_tags = {}
    self.current_tag = ''
    self.finished = False

    def handle_data(self, data):
    print 'data: ' + data

    self.data_tags[self.current_tag] = data
    if self.finished:
       return

    if 'tag1' in self.data_tags.keys() and 'tag' in self.data_tags.keys():
        b = Bag()
        b.tag1 = self.data_tags['tag1']
        b.tag = self.data_tags['tag']
        b.t1_start_idx = self.rawdata.find(b.tag1)
        b.t1_end_idx = len(b.tag1) + b.t1_start_idx
        b.t_start_idx = self.rawdata.find(b.tag)
        b.t_end_idx = len(b.tag) +  b.t_start_idx 
        # swap
        if b.t1_start_idx < b.t_start_idx:
           self.result = self.rawdata[:b.t_start_idx] + b.tag + self.rawdata[b.t_end_idx:]
           self.result = self.result[:b.t1_start_idx] + b.tag1 + self.result[b.t1_end_idx:]
        else:
           self.result = self.rawdata[:b.t1_start_idx] + b.tag1 + self.rawdata[t1_end_idx:]
           self.result = self.result[:b.t_start_idx] + b.tag + self.rresult[t_end_idx:]
        self.finished = True

    def unknown_starttag(self, tag, attrs):
    print 'starttag is: ' + tag
    self.current_tag = tag

data = ""
for line in sys.stdin:
    data += line

print 'data is: ' + data

parser = NodeSwapper()
parser.feed(data)
print parser.result
parser.close()