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

 
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Top Forums UNIX for Dummies Questions & Answers Want to remove all lines but not latest 50 lines from a file
# 1  
Old 10-26-2013
If you really can't tail to another filesystem first, perhaps:
Code:
ex -sc '$-49999,$d | x' file


--
Quote:
Originally Posted by targzeta
From sed(1):
Code:
-i[SUFFIX], --in-place[=SUFFIX]

              edit files in place (makes backup if SUFFIX supplied)

Emanuele
That does not really edit in place. It creates a new file with a different inode.
Last edited by Scrutinizer; 10-26-2013 at 09:30 AM..
# 2  
Old 10-26-2013
Hi, Scrutinizer.
Quote:
Originally Posted by Scrutinizer
If you really can't tail to another filesystem first, perhaps:
Code:
ex -sc '$-49999,$d | x' file

...
Some versions of ex/ed will use a temporary file: see post #4 at Delete first 100 lines from a BIG File - The UNIX and Linux Forums

( From that post, you and I went on to discuss temporary files as a kind of safety issue. )

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
Scrutinizer
 
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