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Shell Programming and Scripting

Capture only the new lines

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Top Forums Shell Programming and Scripting Capture only the new lines
# 1  
Old 05-03-2009
Capture only the new lines
Whenever job run i need to capture only the news in growing file(audit file)?
How can we achieve this?
# 2  
Old 05-03-2009
man tail
# 3  
Old 05-03-2009
tail cmd will give only last given number of lines. I need to get only newlines which is appended in growing files (a.log).
For every run a.ksh which will produce a.log. For example if a.ksh is successful run will then a.log will return 3 rows but if it is unsuccessful run then 2 or any counts of row returned in log file.How do we capture only the latest row returned in a.log

1st run a.ksh
----------
cat a.log
process start
123 counts loaded
process end

2nd run a.ksh
------------
cat a.log
process start
123 counts loaded
process end
process start
149 counts loaded
process end
(here i need to capture last 3 line like tail -3 filename)

3rdrun a.ksh (unsuccessful run)
-----------
cat a.log
process start
123 counts loaded
process end
process start
149 counts loaded
process end
process start
process end
(here i need to capture last two lines)


One way of doing is like taking diff in a.log between before and after run will return the latest line.
Is any other simple cmd to get the newline in audit file?
# 4  
Old 05-03-2009
Quote:
Originally Posted by ford2020
tail cmd will give only last given number of lines. I need to get only newlines which is appended in growing files
Quote:
-f output appended data as the file grows
(extract from man tail)
# 5  
Old 05-03-2009
Code:
tail -f logfile > newfile

you can run that in the background. But make sure you stop it at some point of time.


cheers,
Devaraj Takhellambam
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