delete n last lines of a file Post: 302196158

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delete all lines in file

how can i delete all lines in file by using "vi" ?

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how can I delete lines without actually going into the file

what am trying to do is delete a line in a specific file but I dont know what to do. I cant use the sed or awk commands because these commands dont really alter the original file. they only alter what they display on the screen by the way, am trying to do this from a script so if anybody can...

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delete lines from a file.

I have a file which has about 500K records and I need to delete about 50 records from the file. I know line numbers and am using sed '13456,13457,......d' filename > new file. It does not seem to be working. Any help will greatly appreciated.

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delete the lines from file

i have two files & want to delete the lines from 2nd file which matches with 1st file

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How to delete lines in a file that have duplicates or derive the lines that aper once

Input: a b b c d d I need: a c I know how to get this (the lines that have duplicates) : b d sort file | uniq -d But i need opossite of this. I have searched the forum and other places as well, but have found solution for everything except this variant of the problem.

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How get only required lines & delete the rest of the lines in file

Hiiii I have a file which contains huge data as a.dat: PDE 1990 1 9 18 51 28.90 24.7500 95.2800 118.0 6.1 0.0 BURMA event name: 010990D time shift: 7.3000 half duration: 5.0000 latitude: 24.4200 longitude: 94.9500 depth: 129.6000 Mrr: ...

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In a huge file, Delete duplicate lines leaving unique lines

Hi All, I have a very huge file (4GB) which has duplicate lines. I want to delete duplicate lines leaving unique lines. Sort, uniq, awk '!x++' are not working as its running out of buffer space. I dont know if this works : I want to read each line of the File in a For Loop, and want to...

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Delete lines in a file

Hi This is a sample of my data file. ##field PH01000000 1 4869017 #PH01000000G0240 WWW278545G0240 P.he_model_v1.0 erine 119238 121805 . - . ID=PH01000000G0240;Description="zinc finger, C3HC4 type domain containing protein, expressed"...

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Delete 40 lines after every 24 lines from a file

Hello, I have file of more than 10000 lines. I want to delete 40 lines after every 20 lines. e.g from a huge file, i want to delete line no from 34 - 74, then 94 - 134 etc and so on. Please let me know how i can do it. Best regards,

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Delete Some Lines from File

LEARN ABOUT OPENSOLARIS

tac

TAC(1)								   User Commands							    TAC(1)

NAME

       tac - concatenate and print files in reverse

SYNOPSIS

       tac [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, last line first.  With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --before
	      attach the separator before instead of after

       -r, --regex
	      interpret the separator as a regular expression

       -s, --separator=STRING
	      use STRING as the separator instead of newline

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Jay Lepreau and David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2006 Free Software Foundation, Inc.
       This   is   free   software.    You   may   redistribute   copies   of	it   under   the   terms   of	the  GNU  General  Public  License
       <http://www.gnu.org/licenses/gpl.html>.	There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for tac is maintained as a Texinfo manual.  If the info and tac programs are properly installed at  your	site,  the
       command

	      info tac

       should give you access to the complete manual.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+--------------------+
       |  ATTRIBUTE TYPE    |  ATTRIBUTE VALUE	 |
       +--------------------+--------------------+
       |Availability	    | SUNWgnu-coreutils  |
       +--------------------+--------------------+
       |Interface Stability | Uncommitted	 |
       +--------------------+--------------------+
NOTES

       Source for GNU coreutils is available on http://opensolaris.org.

tac 6.7 							   December 2006							    TAC(1)

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delete all lines in file

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how can I delete lines without actually going into the file

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delete lines from a file.

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delete the lines from file

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How get only required lines & delete the rest of the lines in file

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In a huge file, Delete duplicate lines leaving unique lines

Discussion started by: krishnix