delete first 100 lines from a file


Login or Register to Reply

 
Thread Tools Search this Thread
# 1  
Question delete first 100 lines from a file

I have a file with 28,00,000 lines of rows in this the first 80 lines will be chunks .

I want to delete the chunks of 80 lines. I tried tail -f2799920 filename.
is there any efficient way to do this.

Thanks in advance.
# 3  
if -i option is available in sed ( GNU sed )

use it for in-place modification

Code:
sed -i '1,100d' filename

# 5  
delete liines using sed.

Hi,

I am trying to delete all lines in a file which starts with SG.

Command : sed -e "s/^SG/d/" bcpfile > test1.

But the above command just replaces 'SG' with 'd'. Please suggest the correct command to delete the whole line.

Thanks.
David.
# 6  
sed -e "s/^SG//d"
a2156z
# 7  
Quote:
Originally Posted by a2156z
sed -e "s/^SG//d"
Should be:

Code:
sed "/^SG/d" file

Regards
Login or Register to Reply

|
Thread Tools Search this Thread
Search this Thread:
Advanced Search

More UNIX and Linux Forum Topics You Might Find Helpful
Delete first 100 lines from a BIG File
unohu
Hi, I need a unix command to delete first n (say 100) lines from a log file. I need to delete some lines from the file without using any temporary file. I found sed -i is an useful command for this but its not supported in my environment( AIX 6.1 ). File size is approx 100MB. Thanks in...... UNIX for Advanced & Expert Users
18
UNIX for Advanced & Expert Users
In a huge file, Delete duplicate lines leaving unique lines
krishnix
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...... UNIX for Advanced & Expert Users
16
UNIX for Advanced & Expert Users
How get only required lines & delete the rest of the lines in file
reva
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: ...... UNIX for Dummies Questions & Answers
7
UNIX for Dummies Questions & Answers
How to delete lines in a file that have duplicates or derive the lines that aper once
necroman08
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.... Shell Programming and Scripting
3
Shell Programming and Scripting
delete first 100 lines rather than zero out of file
thepurple
Hi experts, in my solaris 9 the file- /var/adm/messeages growin too first. by 24 hours 40MB. And always giving the below messages-- bash-2.05# tail -f messages Nov 9 16:35:38 ME1 last message repeated 1 time Nov 9 16:35:38 ME1 ftpd: wtmpx /var/adm/wtmpx No such file or directory Nov 9...... Solaris
7
Solaris