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Full Discussion: Read the line from the last and display the one which is non-zero
Top Forums UNIX for Dummies Questions & Answers Read the line from the last and display the one which is non-zero Post 302935498 by hariniiyer300 on Tuesday 17th of February 2015 06:10:48 AM
Old 02-17-2015
Read the line from the last and display the one which is non-zero
Hi All,

My requirement is this. Am trying to find a one liner unix command, which will check the last line of the file for 0. If it is zero, it would pick the previous line, else it should display the last line.

Eg:
Code:
abcd
efgh
ijhk
0
0

Output expected -- ijhk

Please share your ideas.

Thanks.
Last edited by rbatte1; 02-17-2015 at 08:50 AM.. Reason: Added CODE tags
 

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LEARN ABOUT DEBIAN

state_analyzer

STATE_ANALYZER(8)					       AFS Command Reference						 STATE_ANALYZER(8)

NAME

       state_analyzer - Explores and queries the fileserver state database interactively

SYNOPSIS

       state_analyzer [state dump file | -h]

DESCRIPTION

       The demand-attach file server makes host / callback information persistent. On shutdown, the state is saved to database fsstate.dat(5).	On
       startup, the state is read, verified and restored.  This allows for file server shutdowns or restarts without breaking all callbacks (an
       operation that could otherwise take a long time).

       state_analyzer interactively explores and queries the saved state database, fsstate.dat(5).

       This command is only supported on the demand-attach file server.  It operates at an extremely low-level and hence requires detailed
       knowledge of the OpenAFS architecture and code.

COMMANDS

       state_analyzer supports the following interactive commands:

       h <...>	-- host menu
	   o   hdr	-- display the host_state_header struct

	   o   first	-- display the first host

	   o   prev	-- display the previous host

	   o   this	-- display this host

	   o   next	-- display the next host

	   o   last	-- display the last host

	   o   dump	-- display all hosts

       fe <...>  -- FileEntry menu
	   o   hdr	-- display the callback_state_header struct

	   o   first	-- display the first FE

	   o   prev	-- display the previous FE

	   o   this	-- display this FE

	   o   next	-- display the next FE

	   o   last	-- display the last FE

	   o   dump	-- display all FEs

	   o   timeout	-- display the timeout queue heads

	   o   hash	-- display the file entry hash buckets

	   o   find by index id -- find an fe by its array index

	   o   find by fid (vol,vnode,unique) -- find an fe by its AFSFid

       cb <...>  -- CallBack menu
	   o   hdr	-- display the callback_state_entry_header struct

	   o   first	-- display the first CB

	   o   prev	-- display the previous CB

	   o   this	-- display this CB

	   o   next	-- display the next CB

	   o   last	-- display the last CB

	   o   dump	-- display all CBs

       hexdump [offset [len]]  -- hex dump raw data
       quit	-- quit current menu
       exit	-- exit debugger
       help	-- help message

PRIVILEGE REQUIRED

       The issuer must have read access to the file server state database, fsstate.dat.  Usually, this means that the issuer must be the local
       superuser "root" on the file server machine.

SEE ALSO

       fsstate.dat(5), fssync-debug(8), salvsync-debug(8)

COPYRIGHT

       Copyright 2010 Davor Ocelic <docelic@spinlocksolutions.com>

       This documentation is covered by the IBM Public License Version 1.0.  This man page was written by Davor Ocelic for OpenAFS, based on
       documentation from Tom Keiser, Steven Jenkins and others.

OpenAFS 							    2012-03-26							 STATE_ANALYZER(8)
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