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Full Discussion: Reading and writing in same file
Top Forums Shell Programming and Scripting Reading and writing in same file Post 302697083 by Don Cragun on Thursday 6th of September 2012 05:03:00 AM
Old 09-06-2012
Quote:
Originally Posted by kmajumder
Hi tyler,

1. 'abcde' and 'efghi' wont be there in original data. That is what I tried to explain.
The original data is not having the expected value. 'none1111' is the default value if no proper data is found after the 1st grep command.
2. So we have to run a 2nd grep command to replace those default value with expected value with the help of 4th column.
3. 4th column is the only connector b/w the two different log to get the actual 2nd column. So from the first set of data we need to pick up the 4th column (whose 2nd column is 'none1111') and we need to look for other log where we have the same 4th column to pick up the right 2nd column from next log.

Example:- First set of data
1. Consider some grep command gave below result.

12345,none1111,55,link1
56789,dsadsad,66,ewqrrwe
23456,none1111,77,link2
65655,yuytuytds,88,ertywd

2. In second column we get 'none1111' that means we have to run another grep command to pick up right 2nd column value.
Consider we ran another different grep command which takes 'link1' as input and return expected 2nd column i.e 'abcde'.
3. Then we have to replace all the 'none1111' value by iterating the first set of data and following the same procedure.

Hope it makes a bit clear to you.
What is clear to me is:
  1. You have a log file. We don't know what this log file looks like.
  2. You have run grep on the this log file and manipulated the lines that came back to produce a CSV file containing four columns.
  3. You won't tell us how you manipulated the data you grepped to produce the CSV file.
  4. You have another log file. We don't know what this log file looks like either.
  5. You want to match the 4th field in the CSV file you created against something in this second log file and replacenone1111with something else in the second log file.
  6. You aren't giving us enough data to help you.
Show us the names and contents of both log files. Explain the procedures you use to create your CSV file from the first log file. Show us the data in the 2nd log file that we are to match and show us how we determine the replacement fornone1111when we find the correct line in the 2nd log file. Then we may be able to help you.

Note that ryandegreat25 gave you a script that does what you have requested, for the values you've shown us, but almost certainly is not a general solution to the problem you're trying to solve.

Please give us enough information to be able to help you.Smilie
 

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LEARN ABOUT DEBIAN

cmannotifyd

cmannotifyd(8)						     CMAN Notification Daemon						    cmannotifyd(8)

NAME

       cmannotifyd - CMAN Notification Daemon

SYNOPSIS

       cmannotifyd [-f] [-d]

DESCRIPTION

       The cmannotifyd daemon talks to CMAN and provides a mechanism to notify external entities about cluster changes.

       CMAN dispatches 3 kind of notifications:

       - CMAN_REASON_TRY_SHUTDOWN when cman requests to all clients if it is allowed to shutdown.

       - CMAN_REASON_STATECHANGE when cman detects a node joining or leaving the cluster.

       - CMAN_REASON_CONFIG_UPDATE when a configuration change event has been detected/requested.

       These notifications are then dispatched to the shell script cman_notify in the environment variable CMAN_NOTIFICATION.

       cman_notify will then execute all the scripts in the configured notification directory (default: /etc/cluster/cman-notify.d) passing a very
       minimal set of envvars including, of course, the CMAN_NOTIFICATION= type.  The execution order is set by the filename as shown by "LC_ALL=C
       ls -las".

       cmannotifyd logs are stored in the default log file (/var/log/cluster/cmannotifyd.log).

       cman_notify  logs are stored in the default log file (/var/log/cluster/cman_notify.log). By default the output from the scripts executed by
       cman_notify is redirected to /dev/null.	Users can either set CMAN_NOTIFICATION_DEBUG=1 in their environment or set proper debug configura-
       tion in cluster.conf to redirect scripts output to the cman_notify log file.

NOTES

       cmannotifyd does not block on cman_notify nor check the exit status of the script.

       Notifications are dispatched in the same order as they arrive, one by one.

       CMAN_REASON_TRY_SHUTDOWN  is  passed  to  scripts  for information only, they can not influence cman's decsion about whether or not to shut
       down.

       CMAN_REASON_STATECHANGE also implies CMAN_NOTIFICATION_QUORUM exported in the environment. CMAN_NOTIFICATION_QUORUM will be set to 1  (when
       the node is part of a quorate cluster) or 0 (otherwise).

       A template for cman_notify scripts can be found in the doc/ directory.

OPTIONS

       -f     Run in the foreground (do not fork / daemonize).

       -d     Enable debug output.

								   November 2008						    cmannotifyd(8)
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