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Operating Systems Linux Linux command to find and replace occurance of more than two equal sign with "==" from XML file. Post 302661093 by alister on Sunday 24th of June 2012 06:53:37 PM
Old 06-24-2012
Quote:
Originally Posted by bakunin
... because there is a trick:

Code:
(cat /path/to/file) | sed '<somecommand>' > /path/to/file

This will work for files which are small enough to fit into memory. The downside is, that if anything goes wrong (power loss, reboot, process aborted, ...) your data will be irrevocably destroyed. You sure do not want to use this hack on critical data just to save a few GB of (temporary) diskspace.
That won't work even when there's just a single byte in the file, if the shell first creates the sed portion of the pipeline. There are no guarantees on which component of a pipeline will be created first.

Regards,
Alister
 

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PACEMAKER(8)						  System Administration Utilities					      PACEMAKER(8)

NAME
Pacemaker - Part of the Pacemaker cluster resource manager SYNOPSIS
cibadmin command [options] [data] DESCRIPTION
cibadmin - Provides direct access to the cluster configuration. Allows the configuration, or sections of it, to be queried, modified, replaced and deleted. Where necessary, XML data will be obtained using the -X, -x, or -p options OPTIONS
-?, --help This text -$, --version Version information -V, --verbose Increase debug output Commands: -u, --upgrade Upgrade the configuration to the latest syntax -Q, --query Query the contents of the CIB -E, --erase Erase the contents of the whole CIB -B, --bump Increase the CIB's epoch value by 1 -C, --create Create an object in the CIB. Will fail if the object already exists. -M, --modify Find the object somewhere in the CIB's XML tree and update it. Fails if the object does not exist unless -c is specified -P, --patch Supply an update in the form of an xml diff (See also: crm_diff) -R, --replace Recursivly replace an object in the CIB -D, --delete Delete the first object matching the supplied criteria, Eg. <op id="rsc1_op1" name="monitor"/> The tagname and all attributes must match in order for the element to be deleted -d, --delete-all When used with --xpath, remove all matching objects in the configuration instead of just the first one -5, --md5-sum Calculate the on-disk CIB digest -6, --md5-sum-versioned Calculate an on-the-wire versioned CIB digest -S, --sync (Advanced) Force a refresh of the CIB to all nodes -a, --empty Output an empty CIB Additional options: -f, --force -t, --timeout=value Time (in seconds) to wait before declaring the operation failed -s, --sync-call Wait for call to complete before returning -l, --local Command takes effect locally. Should only be used for queries -c, --allow-create (Advanced) Allow the target of a -M operation to be created if they do not exist -n, --no-children (Advanced) When querying an object, do not return include its children in the result Data: -X, --xml-text=value Retrieve XML from the supplied string -x, --xml-file=value Retrieve XML from the named file -p, --xml-pipe Retrieve XML from stdin -A, --xpath=value A valid XPath to use instead of -o -o, --scope=value Limit the scope of the operation to a specific section of the CIB. Valid values are: nodes, resources, constraints, crm_config, rsc_defaults, op_defaults, status -N, --node=value (Advanced) Send command to the specified host EXAMPLES
Query the configuration from the local node: # cibadmin --query --local Query the just the cluster options configuration: # cibadmin --query --scope crm_config Query all 'target-role' settings: # cibadmin --query --xpath "//nvpair[@name='target-role']" Remove all 'is-managed' settings: # cibadmin --delete-all --xpath "//nvpair[@name='is-managed']" Remove the resource named 'old': # cibadmin --delete --xml-text '<primitive id="old"/>' Remove all resources from the configuration: # cibadmin --replace --scope resources --xml-text '<resources/>' Replace the complete configuration with the contents of $HOME/pacemaker.xml: # cibadmin --replace --xml-file $HOME/pacemaker.xml Replace the constraints section of the configuration with the contents of $HOME/constraints.xml: # cibadmin --replace --scope constraints --xml-file $HOME/constraints.xml Increase the configuration version to prevent old configurations from being loaded accidentally: # cibadmin --modify --xml-text '<cib admin_epoch="admin_epoch++"/>' Edit the configuration with your favorite $EDITOR: # cibadmin --query > $HOME/local.xml # $EDITOR $HOME/local.xml # cibadmin --replace --xml-file $HOME/local.xml SEE ALSO: CRM shell, crm(8), crm_shadow(8) AUTHOR
Written by Andrew Beekhof REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org Pacemaker 1.1.7 April 2012 PACEMAKER(8)
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