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Top Forums Shell Programming and Scripting How to delete lines from text file? Post 302541996 by TuAd on Tuesday 26th of July 2011 10:33:30 AM
Old 07-26-2011
Question How to delete lines from text file?

hi guys,

I have very large txt files (200GB) and just want to to delete the first two lines (headers). So far I used

Code:
sed -i '1,2d' infile.txt

but this command always takes extremely long as it writes all again. Is there a better way to do it (ie just to delete the lines without writing all again?)

Many thanks for your help!
 

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BEAV(1) 						      General Commands Manual							   BEAV(1)

NAME
beav - binary file editor and viewer SYNOPSIS
beav [file...] DESCRIPTION
This is a brief description of the minimal set of commands that are necessary to start using beav effectively. For more information, review the file /usr/share/doc/beav/beav140.txt.gz. The file-visit command, Ctl-X Ctl-V, can be used to read a file in for editing. The file can also be read in from the command line; beav <edit_file>. Data is displayed in one or more windows. These commands can be used to navigate around the windows. move-back-char Ctl-B moves left move-back-line Ctl-P moves up move-forw-char Ctl-F moves right move-forw-line Ctl-N moves down window-delete Ctl-X 0 delete window window-expand Ctl-X 1 expand window The move-to-byte command, Ctl-X G, will prompt you for a byte position to move to. These commands will insert a zero byte at the cursor position or delete the byte at that position. insert-unit Ctl-X I delete-forw-unit Esc D The file-save command, Ctl-X Ctl-S, will save the data to the file if a change has been made. The help command, Esc ?, will display a list of all commands and their current key bindings. The abort-cmd command, Ctl-G, will abort any command that is in operation. The quit-no-save command, Ctl-X Ctl-C, will exit beav. If there is any data that has not been saved you will be warned. FILES
/usr/share/doc/beav/beav140.txt.gz BEAV(1)
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