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Simple script to delete last n lines

Posted 10-29-2013 at 10:53 AM by dinakumar12
Updated 12-31-2013 at 01:18 AM by dinakumar12

This may be possible using a single command but a very small and simple script though.Here we are deleting last 3 lines from a file.

#!/bin/bash
#Assign the number of lines to be deleted to variable "a"
a=3
i=1
while [ $i -le $a ]
do
sed -i '$d' file
i=$(($i + 1))
done
Posted in Uncategorized
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Comments

  1. Old Comment
    how to using the script,
    It's getting parameter or have to defile file path in script, or what else?
    I think, you have to give a sample to understandable.

    for example,
    should write command like following to delete last 3 lines of file.txt

    # script.sh file.txt

    Regards
    Posted 11-02-2013 at 12:44 PM by idogan idogan is offline
  2. Old Comment
    Using this script i am deleting last three lines from a file

    Here in this case, my script and the file in which the lines to be deleted are in the same location.

    so simply run

    ./script or sh -x script

    so that last three lines from filename called file would be deleted.

    Note : the filename is mentioned in the script itself, if your file is in someother location just edit the script as
    "sed -i '$d' path_to_the_file_whose_lines_to_be_deleted" and run the script.
    Posted 12-31-2013 at 01:22 AM by dinakumar12 dinakumar12 is offline
    Updated 12-31-2013 at 01:27 AM by dinakumar12
 

  



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