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copied!<p>You may read the entire contents of nutch-default.xml to a variable, edit the contents of that variable with xmlstarlet and then write the result back to nutch-default.xml again.</p> <p>Another way would be to use open file handles as described in <a href="https://stackoverflow.com/questions/2585438/redirect-output-from-sed-s-c-d-myfile-to-myfile">Redirect output from sed 's/c/d/' myFile to myFile</a> .</p> <pre><code>xmlstarlet --version # 1.0.6 xmlstarlet ed --help | less -Ip 'inplace' # 1. # in-place version using xmlstarlet only curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain' xmlstarlet edit -L -u "/configuration/property[name='http.agent.name']"/value -v 'test' nutch-default.xml xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml # 2. # variable version curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain' xmlstr="$(< nutch-default.xml)" # save file contents to variable printf '%s\n' "$xmlstr" | xmlstarlet edit -u "/configuration/property[name='http.agent.name']"/value -v 'test' > nutch-default.xml xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml # 3. # file handle version # cf. https://stackoverflow.com/questions/2585438/redirect-output-from-sed-s-c-d-myfile-to-myfile curl -L -s -o nutch-default.xml 'http://svn.apache.org/viewvc/nutch/branches/branch-1.3/conf/nutch-default.xml?view=co&revision=1079746&content-type=text%2Fplain' exec 3<nutch-default.xml rm nutch-default.xml # prevent open file from being truncated xmlstarlet edit -u "/configuration/property[name='http.agent.name']"/value -v 'test' <&3 >nutch-default.xml xmlstarlet sel -t -c "/configuration/property[name='http.agent.name']"/value nutch-default.xml </code></pre>

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