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Full Discussion: Removing consecutive lines in a file
Top Forums Shell Programming and Scripting Removing consecutive lines in a file Post 302562335 by ctsgnb on Thursday 6th of October 2011 02:31:21 PM
Old 10-06-2011
The getline solution just egrep -ve '^Begin|^End'

If you only want to retain the Begin/End block who contains at least 1 or more lines (and keeping the Begin and End lines of those blocks) then you can go for :

Code:
nawk '{A[NR]=$0}/^Begin/{b=NR}/^End/&&((NR-b)>1){for(i=b-1;++i<=NR;) print A[i]}' infile

you can then play with b or b-1 as well as <NR or <=NR of the "for" loop depending on your need of the Bein/End lines or not
Last edited by ctsgnb; 10-06-2011 at 03:48 PM..
 

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LEARN ABOUT CENTOS

nislog

nislog(1M)                                                System Administration Commands                                                nislog(1M)

NAME

       nislog - display the contents of the NIS+ transaction log

SYNOPSIS

       /usr/sbin/nislog [-h num | -t num]  [-v] [directory...]

DESCRIPTION

       nislog  displays  the  contents of the NIS+ server transaction log on the standard output. This command can be used to track changes in the
       namespace. The /var/nis/trans.log file contains the transaction log maintained by the NIS+ server. When updates occur, they are  logged  to
       this  file  and  then  propagated  to replicas as log transactions.  When the log is checkpointed, updates that have been propagated to the
       replicas are removed.

       The nislog command can only be run on an NIS+ server by superuser. It displays the log entries for that server only.

       If directory is not specified, the entire log is searched. Otherwise, only those logs entries that correspond to the specified  directories
       are displayed.

OPTIONS

       -h num          Display num transactions from the ``head'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -t num          Display  num transactions from the ``tail'' of the log. If the numeric parameter is  0, only the log header is displayed.

       -v              Verbose mode.

FILES

       /var/nis/trans.log      transaction log

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWnisu                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       nis+(1), rpc.nisd(1M), nisfiles(4), attributes(5)

NOTES

       NIS+  might  not  be  supported in future releases of the SolarisTM Operating Environment. Tools to aid the migration from NIS+ to LDAP are
       available in the Solaris 9 operating environment. For more information, visit http://www.sun.com/directory/nisplus/transition.html.

SunOS 5.10                                                          12 Dec 2001                                                         nislog(1M)
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