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Full Discussion: Why sed command deletes last line in a file if no carriage return?
Top Forums Shell Programming and Scripting Why sed command deletes last line in a file if no carriage return? Post 302533526 by ashok.k on Friday 24th of June 2011 02:30:13 AM
Old 06-24-2011
Why sed command deletes last line in a file if no carriage return?
Hi

I am using sed command to make SCORE=somevalue to SCORE=blank in a file.

Please see the attached lastline.txt file. After executing the below command on the file, it removes the last line.
Code:
cat lastline.txt | sed 's/SCORE=.*$/SCORE=/g' > newfile.txt

Why does sed command remove the last line in the file if there is no carriage return?

Also if i use echo \\r >> lastline.txt and then execute the command it works fine and the last line is not removed.

Also, How to check if the last line already has a carriage return or not ? and add if there is no carriage return?

Input File : lastline.txt
Code:
[KEY A]
TABLE=TableA
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreA
[KEY B]
TABLE=TableB
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreB
[KEY C]
TABLE=TableC
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreC
[KEY D]
TABLE=TableD
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreD
[KEY E]
TABLE=TableB
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreB
[KEY F]
TABLE=TableF
KEY=KEYF
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreF
[KEY G]
TABLE=TableA
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreG
[KEY H]
TABLE=TableB
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreH
[KEY I]
TABLE=TableA
KEY=KEYA
DESC=VALUE
ORDERBY=Id
SCORE=C:\Common\TestscoreI

Please note that there should not be any blank line at the bottom of input file. No carriage return on the last line.

Thanks
Ashok
lastline.txt (720 Bytes) 
Last edited by Franklin52; 06-24-2011 at 03:52 AM.. Reason: Please use code tags for code and data samples, thank you
 

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LEARN ABOUT DEBIAN

jifty::web::session::jdbi

Jifty::Web::Session::JDBI(3pm)				User Contributed Perl Documentation			    Jifty::Web::Session::JDBI(3pm)

NAME

       Jifty::Web::Session - A Jifty session handler

SYNOPSIS

       In your etc/config.yml (optional):

	 framework:
	   Web:
	     # The default ($PORT is replaced by the port the app is running on)
	     SessionCookieName: JIFTY_SID_$PORT

   new
       Returns a new, empty session.

   id
       Returns the session's id if it has been loaded, or "undef" otherwise.

   create
       Creates a new row in the Jifty::Model::Session table.

   load [ID]
       Load up the current session from the given "ID", or the appropriate cookie (see "cookie_name") otherwise.  If both of those fail, creates a
       session in the database.

   load_by_kv key => value
       Load up the current session from the given (key, value) pair. If no matching session could be found, it will create a new session with the
       key, value set.	Be sure that what you're loading by is unique. If you're loading a session based on, say, a timestamp, then you're asking
       for trouble.

   get KEY [TYPE]
       Returns the value for "KEY" for the current user's session.  "TYPE", which defaults to "key", allows accessing of other namespaces in the
       session, including "metadata" and "continuation".

   set KEY => VALUE, [TYPE]
       Sets the value "VALUE" for "KEY" for the session.  "TYPE", which defaults to "key", allows values to be set in other namespaces, including
       "metadata" and "continuation". "VALUE" can be an arbitrary perl data structure -- "Jifty::Web::Session" will serialize it for you.

   remove KEY, [TYPE]
       Remove key "KEY" from the cache.  "TYPE" defaults to "key".

   remove_all
       Removes the session from the database entirely.

   continuations
       Return a hash of all the continuations in this session, keyed by the continuations' "id".

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