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Top Forums Shell Programming and Scripting Ed to modify a file --- or not? Post 302997802 by Don Cragun on Friday 19th of May 2017 02:48:32 PM
Old 05-19-2017
From the output you have shown us, it appears that ed is doing what you requested. So, if the contents of /etc/oratab have gone back to their original state when the script terminates, it would seem likely that has modified the file.

If the command:
Code:
grep oratab scriptname

where scriptame is the name of the file containing your shell script doesn't show any output other than:
Code:
echo `date +%Y-%m-%d" "%H:%M:%S` - Modifying /etc/oratab
echo Original oratab entry for dwdev:
grep ^dwdev /etc/oratab
ed -s /etc/oratab <<EOF
echo New oratab entry for dwdev:
grep ^dwdev /etc/oratab

then one might guess that:
  1. something in your script invokes another command that resets /etc/oratab's contents,
  2. there is another directory entry hard-linked to /etc/oratab and your script is modifying the file using a different filename,
  3. there is another file that is a symbolic link pointing to /etc/oratab and your script is modifying the file using the name of one of those symbolic links, or
  4. some other script is asynchronously changing the contents of /etc/oratab that seems to run consistently between the time the second grep in your code shows that the file changed and the time when you notice that the contents have reverted to their original contents after your script terminates.
This User Gave Thanks to Don Cragun For This Post:
 

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OCF_HEARTBEAT_ORACLE(7) 					OCF resource agents					   OCF_HEARTBEAT_ORACLE(7)

NAME
ocf_heartbeat_oracle - Manages an Oracle Database instance SYNOPSIS
oracle [start | stop | status | monitor | validate-all | methods | meta-data] DESCRIPTION
Resource script for oracle. Manages an Oracle Database instance as an HA resource. SUPPORTED PARAMETERS
sid The Oracle SID (aka ORACLE_SID). (required, string, no default) home The Oracle home directory (aka ORACLE_HOME). If not specified, then the SID along with its home should be listed in /etc/oratab. (optional, string, no default) user The Oracle owner (aka ORACLE_OWNER). If not specified, then it is set to the owner of file $ORACLE_HOME/dbs/*${ORACLE_SID}.ora. If this does not work for you, just set it explicitely. (optional, string, no default) ipcrm Sometimes IPC objects (shared memory segments and semaphores) belonging to an Oracle instance might be left behind which prevents the instance from starting. It is not easy to figure out which shared segments belong to which instance, in particular when more instances are running as same user. What we use here is the "oradebug" feature and its "ipc" trace utility. It is not optimal to parse the debugging information, but I am not aware of any other way to find out about the IPC information. In case the format or wording of the trace report changes, parsing might fail. There are some precautions, however, to prevent stepping on other peoples toes. There is also a dumpinstipc option which will make us print the IPC objects which belong to the instance. Use it to see if we parse the trace file correctly. Three settings are possible: - none: don't mess with IPC and hope for the best (beware: you'll probably be out of luck, sooner or later) - instance: try to figure out the IPC stuff which belongs to the instance and remove only those (default; should be safe) - orauser: remove all IPC belonging to the user which runs the instance (don't use this if you run more than one instance as same user or if other apps running as this user use IPC) The default setting "instance" should be safe to use, but in that case we cannot guarantee that the instance will start. In case IPC objects were already left around, because, for instance, someone mercilessly killing Oracle processes, there is no way any more to find out which IPC objects should be removed. In that case, human intervention is necessary, and probably _all_ instances running as same user will have to be stopped. The third setting, "orauser", guarantees IPC objects removal, but it does that based only on IPC objects ownership, so you should use that only if every instance runs as separate user. Please report any problems. Suggestions/fixes welcome. (optional, string, default instance) clear_backupmode The clear of the backup mode of ORACLE. (optional, boolean, default false) shutdown_method How to stop Oracle is a matter of taste it seems. The default method ("checkpoint/abort") is: alter system checkpoint; shutdown abort; This should be the fastest safe way bring the instance down. If you find "shutdown abort" distasteful, set this attribute to "immediate" in which case we will shutdown immediate; If you still think that there's even better way to shutdown an Oracle instance we are willing to listen. (optional, string, default checkpoint/abort) SUPPORTED ACTIONS
This resource agent supports the following actions (operations): start Starts the resource. Suggested minimum timeout: 120. stop Stops the resource. Suggested minimum timeout: 120. status Performs a status check. Suggested minimum timeout: 5. monitor Performs a detailed status check. Suggested minimum timeout: 30. Suggested interval: 120. validate-all Performs a validation of the resource configuration. Suggested minimum timeout: 5. methods Suggested minimum timeout: 5. meta-data Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5. EXAMPLE
The following is an example configuration for a oracle resource using the crm(8) shell: primitive example_oracle ocf:heartbeat:oracle params sid=string op monitor depth="0" timeout="30" interval="120" SEE ALSO
http://www.linux-ha.org/wiki/oracle_(resource_agent) AUTHOR
Linux-HA contributors (see the resource agent source for information about individual authors) resource-agents 1.0.3 07/05/2010 OCF_HEARTBEAT_ORACLE(7)
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