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Top Forums Shell Programming and Scripting Removing lines from a file being used by another process using SHELL script Post 302705499 by nikhil8 on Tuesday 25th of September 2012 03:39:11 AM
Old 09-25-2012
Removing lines from a file being used by another process using SHELL script

Hi All,

Need a small help in writing a shell script which can delete a few lines from a file which is currently being used by another process.

File gets appended using tee -a command due to which its size is getting increased.
Contents like :
Code:
[INFO] 25/09/2012 05:18 Run ID:56579677-1

My requirement is to remove lines which are more than 1 month old...
for this i will cut month from the line i.e. 09 and backtrack to fetch the previous value i.e. 8
and remove all lines from top till the row fetched...

Query is can i remove the lines in the same file ? (what if another process comes to write in that file using tee -a)..

Thanks,
Nik

Last edited by Scrutinizer; 09-25-2012 at 04:39 AM.. Reason: code tags
 

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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.11 30 Jan 2004 script(1)
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