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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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GIT-STRIPSPACE(1)						    Git Manual							 GIT-STRIPSPACE(1)

NAME
git-stripspace - Remove unnecessary whitespace SYNOPSIS
git stripspace [-s | --strip-comments] < input DESCRIPTION
Clean the input in the manner used by git for text such as commit messages, notes, tags and branch descriptions. With no arguments, this will: o remove trailing whitespace from all lines o collapse multiple consecutive empty lines into one empty line o remove empty lines from the beginning and end of the input o add a missing to the last line if necessary. In the case where the input consists entirely of whitespace characters, no output will be produced. NOTE: This is intended for cleaning metadata, prefer the --whitespace=fix mode of git-apply(1) for correcting whitespace of patches or files in the repository. OPTIONS
-s, --strip-comments Skip and remove all lines starting with #. EXAMPLES
Given the following noisy input with $ indicating the end of a line: |A brief introduction $ | $ |$ |A new paragraph$ |# with a commented-out line $ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out. $ | $ |The end.$ | $ Use git stripspace with no arguments to obtain: |A brief introduction$ |$ |A new paragraph$ |# with a commented-out line$ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out.$ |$ |The end.$ Use git stripspace --strip-comments to obtain: |A brief introduction$ |$ |A new paragraph$ |explaining lots of stuff.$ |$ |The end.$ GIT
Part of the git(1) suite Git 1.7.10.4 11/24/2012 GIT-STRIPSPACE(1)
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