Want to remove all lines but not latest 50 lines from a file


 
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# 1  
Old 10-25-2013
Want to remove all lines but not latest 50,000 lines from a file

Hi,

I have a huge file which has Lacs of lines. File system got full.

I want your guys help to suggest me a solution so that I can remove all lines from that file but not last 50,000 lines. I want solution which can remove lines from existing file so that I can have some space left with.

Last edited by prashant2507198; 10-25-2013 at 05:40 AM..
# 2  
Old 10-25-2013
50 or 50000 ?
# 3  
Old 10-25-2013
50000. Number is not a concern I can change it. I want method how to do that.
# 4  
Old 10-25-2013
You can start by looking at tail command...
# 5  
Old 10-25-2013
tail command is just printing. I have to redirect output to a new file which I cannot cos I have no space left. I want a command which can just delete all lines but not latest y lines from existing file.
# 6  
Old 10-25-2013
I dont know... normally people would redirect in a file somewhere else (You dont have just that filesystem do you?) where space isnt an issue then overwrite...
Im saying that because most editing utilities would create a temorary file in /tmp or /var/tmp... if you are that stuck you will have to do some cleaning up first then

Last edited by vbe; 10-25-2013 at 08:49 AM.. Reason: typo hehe
# 7  
Old 10-25-2013
And again, if you want serious help you should give relevant complete information like your OS (shell you use when relevant...) in this case an output of a df command etc..
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