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Full Discussion: updates only
Top Forums Shell Programming and Scripting updates only Post 302283339 by otheus on Tuesday 3rd of February 2009 05:44:30 AM
Old 02-03-2009
Can the file change anywhere? Or can lines only be added to it? If lines can only be added to it, just keep track of the last line number:
Code:
wc -l <filename> >/root/lastcheck-line.dat

Then a while later, do:
Code:
read L </root/lastcheck-line.dat
awk "NR==$L,0" <filename>  >/root/temp.txt

Once you're done, you can print the length again. You can do it altogether this way:
Code:
L=1; test -s /root/lastcheck-line.dat && read L </root/lastcheck-line.dat
awk "NR==$L,0 { print } END { print NR >'/root/lastcheck-line.dat' }" <filename>  >/root/temp.txt

 

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LEARN ABOUT OPENSOLARIS

sulog

sulog(4)							   File Formats 							  sulog(4)

NAME

       sulog - su command log file

SYNOPSIS

       /var/adm/sulog

DESCRIPTION

       The  sulog file is a record of all attempts by users on the system  to execute the su(1M) command.  Each time  su(1M) is executed, an entry
       is added to the sulog file.

       Each entry in the sulog file is a single line of the form:

	 SU date time
	 result port user-newuser

       where

       date	  The month and date su(1M) was executed.  date is displayed in the form mm/dd where  mm is the month number and  dd  is  the  day
		  number in the month.

       time	  The time  su(1M) was executed. time is displayed in the form	HH/MM where  HH is the hour number (24 hour system) and  MM is the
		  minute number.

       result	  The result of the  su(1M) command.  A ` + ' sign is displayed in this field if the su attempt was successful; otherwise  a ` - '
		  sign is displayed.

       port	  The name of the terminal device from which  su(1M) was executed.

       user	  The user id of the user executing the  su(1M) command.

       newuser	  The user id being switched to with  su(1M).

EXAMPLES

       Example 1 A sample sulog file.

       Here is a sample sulog file:

	 SU 02/25 09:29 + console root-sys
	 SU 02/25 09:32 + pts/3 user1-root
	 SU 03/02 08:03 + pts/5 user1-root
	 SU 03/03 08:19 + pts/5 user1-root
	 SU 03/09 14:24 - pts/5 guest3-root
	 SU 03/09 14:24 - pts/5 guest3-root
	 SU 03/14 08:31 + pts/4 user1-root

FILES

       /var/adm/sulog	  su log file

       /etc/default/su	  contains the default location of  sulog

SEE ALSO

       su(1M)

SunOS 5.11							    6 Jun 1994								  sulog(4)
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