delete all lines in file Post: 17112

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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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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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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 DEBIAN

notmuch-mutt

NOTMUCH-MUTT(1) 					User Contributed Perl Documentation					   NOTMUCH-MUTT(1)

NAME

       notmuch-mutt - notmuch (of a) helper for Mutt

SYNOPSIS

       notmuch-mutt [OPTION]... search [SEARCH-TERM]...
       notmuch-mutt [OPTION]... thread < MAIL
       notmuch-mutt [OPTION]... tag [TAGS]... < MAIL

DESCRIPTION

       notmuch-mutt is a frontend to the notmuch mail indexer capable of populating a maildir with search results.

OPTIONS

       -o DIR
       --output-dir DIR
	   Store search results as (symlink) messages under maildir DIR. Beware: DIR will be overwritten. (Default:
	   ~/.cache/notmuch/mutt/results/)

       -p
       --prompt
	   Instead of using command line search terms, prompt the user for them (only for "search").

       -h
       --help
	   Show usage information and exit.

INTEGRATION WITH MUTT

       notmuch-mutt can be used to integrate notmuch with the Mutt mail user agent (unsurprisingly, given the name). To that end, you should
       define macros like the following in your Mutt configuration (usually one of: ~/.muttrc, /etc/Muttrc, or a configuration snippet under
       /etc/Muttrc.d/):

	   macro index <F8> 
		 "<enter-command>unset wait_key<enter><shell-escape>notmuch-mutt --prompt search<enter><change-folder-readonly>~/.cache/notmuch/mutt/results<enter>" 
		 "notmuch: search mail"
	   macro index <F9> 
		 "<enter-command>unset wait_key<enter><pipe-message>notmuch-mutt thread<enter><change-folder-readonly>~/.cache/notmuch/mutt/results<enter><enter-command>set wait_key<enter>" 
		 "notmuch: reconstruct thread"
	   macro index <F6> 
		 "<enter-command>unset wait_key<enter><pipe-message>notmuch-mutt tag -inbox<enter>" 
		 "notmuch: remove message from inbox"

       The first macro (activated by <F8>) prompts the user for notmuch search terms and then jump to a temporary maildir showing search results.
       The second macro (activated by <F9>) reconstructs the thread corresponding to the current mail and show it as search results. The third
       macro (activated by <F6>) removes the tag "inbox" from the current message; by changing "-inbox" this macro may be customised to add or
       remove tags appropriate to the users notmuch work-flow.

       To keep notmuch index current you should then periodically run "notmuch new". Depending on your local mail setup, you might want to do that
       via cron, as a hook triggered by mail retrieval, etc.

SEE ALSO

       mutt(1), notmuch(1)

AUTHOR

       Copyright: (C) 2011-2012 Stefano Zacchiroli <zack@upsilon.cc>

       License: GNU General Public License (GPL), version 3 or higher

perl v5.14.2							    2012-06-02							   NOTMUCH-MUTT(1)

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