delete all lines in file Post: 17145

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

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...

2. Shell Programming and Scripting

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.

3. Shell Programming and Scripting

delete the lines from file

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

4. Shell Programming and Scripting

delete n last lines of a file

Hello!!! how can I delete the last n lines of a file??? Thanks

5. Shell Programming and Scripting

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.

6. UNIX for Dummies Questions & Answers

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: ...

7. UNIX for Advanced & Expert Users

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...

8. UNIX for Dummies Questions & Answers

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"...

9. Shell Programming and Scripting

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,

10. UNIX for Beginners Questions & Answers

Delete Some Lines from File

LEARN ABOUT REDHAT

touch

TOUCH(1)							   User Commands							  TOUCH(1)

NAME

       touch - change file timestamps

SYNOPSIS

       touch [OPTION]... FILE...

DESCRIPTION

       Update the access and modification times of each FILE to the current time.

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

       -a     change only the access time

       -B, --backward=SECONDS
	      Modify  the time by going back SECONDS seconds.  For example, touch -r foo -B 5 bar will make the file bar 5 seconds older than file
	      foo.

       -c, --no-create
	      do not create any files

       -d, --date=STRING
	      parse STRING and use it instead of current time

       -F, --forward=SECONDS
	      Modify the time by going forward SECONDS seconds.  For example, touch -r foo -F 5 bar will make the file bar 5  seconds  newer  than
	      file foo.

       -f     (ignored)

       -m     change only the modification time

       -r, --reference=FILE
	      use this file's times instead of current time

       -t STAMP
	      use [[CC]YY]MMDDhhmm[.ss] instead of current time

       --time=WORD
	      set time given by WORD: access atime use (same as -a) modify mtime (same as -m)

       --help display this help and exit

       --version
	      output version information and exit

       Note that the -d and -t options accept different time-date formats.

AUTHOR

       Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith.

REPORTING BUGS

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

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

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

	      info touch

       should give you access to the complete manual.

touch (coreutils) 4.5.3 					   October 2002 							  TOUCH(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

how can I delete lines without actually going into the file

Discussion started by: TRUEST

2. Shell Programming and Scripting

delete lines from a file.

Discussion started by: oracle8

3. Shell Programming and Scripting

delete the lines from file

Discussion started by: sameersam

4. Shell Programming and Scripting

delete n last lines of a file

Discussion started by: ncatdesigner