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Full Discussion: Finding a match and deleting the line above to it..
Top Forums Shell Programming and Scripting Finding a match and deleting the line above to it.. Post 302743689 by raosr020 on Thursday 13th of December 2012 10:51:30 AM
Old 12-13-2012
Hi Pamu,

Thanks for the reply!!

But with that code any other revoke connect lines also getting deleted (ex: revoke connect from CALU is also getting deleted).

My original file:

Code:
Sun is Hot
Moon is cool
;

-- Mon Sep 10 08:54:10 CDT 2012
-- Mon Sep 11 08:54:10 CDT 2012
-- Mon Sep 12 08:54:10 CDT 2012
revoke connect from SREE;
delete from = 'SREE';
grant connect to SREE with 'fastcar8';
 
-- Mon Sep 12 08:54:10 CDT 2011
revoke connect from CALU;
delete from = 'CALU';
grant connect to CALU with 'calendar';

After running the below command:
Code:
awk '{if($0 ~ /^--/){A[++a]=$0}else if(a && $0 !~ /revoke connect from SREE/){for(i=1;i<=a;i++){print A[a]};a=0}else{print ;a=0}}' file

Output is as follows:
Code:
Sun is Hot
Moon is cool
;

revoke connect from SREE;
delete from = 'SREE';
grant connect to SREE with 'fastcar8';
 
-- Mon Sep 12 08:54:10 CDT 2011
delete from = 'CALU';
grant connect to CALU with 'calendar';

In above ouput
Code:
revoke connect from CALU;

line is missing. That shouldn't happen. Please correct the code.


And i cann't redirect this output to a temporary file. These changes should happen to the original file itself.

Please help me in getting these two requirements solved.

Thanks,
Sreenivas

---------- Post updated at 09:21 PM ---------- Previous update was at 06:50 PM ----------

Hi Scrutinizer

Thanks for the reply!!

Your code is not working. Please suggest me the solution based on the above requirement.

Thanks,
Sreenivas
Last edited by raosr020; 12-13-2012 at 11:46 AM.. Reason: changes made
 

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LEARN ABOUT LINUX

revoke

REVOKE(2)						      BSD System Calls Manual							 REVOKE(2)

NAME

     revoke -- revoke file access

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     revoke(const char *path);

DESCRIPTION

     The revoke() system call invalidates all current open file descriptors in the system for the file named by path.  Subsequent operations on
     any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end
     of file), and a close() system call will succeed.	If the file is a special file for a device which is open, the device close function is
     called as if all open references to the file had been closed.

     Access to a file may be revoked only by its owner or the super user.  The revoke() system call is currently supported only for block and
     character special device files.  It is normally used to prepare a terminal device for a new login session, preventing any access by a previ-
     ous user of the terminal.

RETURN VALUES

     The revoke() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     Access to the named file is revoked unless one of the following:

     [ENOTDIR]		A component of the path prefix is not a directory.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or an entire path name exceeded 1024 characters.

     [ENOENT]		The named file or a component of the path name does not exist.

     [EACCES]		Search permission is denied for a component of the path prefix.

     [ELOOP]		Too many symbolic links were encountered in translating the pathname.

     [EFAULT]		The path argument points outside the process's allocated address space.

     [EINVAL]		The implementation does not support the revoke() operation on the named file.

     [EPERM]		The caller is neither the owner of the file nor the super user.

SEE ALSO

     close(2), revoke(1)

HISTORY

     The revoke() system call first appeared in 4.3BSD-Reno.

BSD
								   June 4, 1993 							       BSD
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