Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Re: Deleting first and last lines of a text file

by morgon (Deacon)
on May 16, 2014 at 09:32 UTC ( #1086269=note: print w/ replies, xml ) Need Help??


in reply to Deleting first and last TWO(2) lines of a text file

perl -i.old -ne 'print unless $.==1 or eof' <input-file>
This will also keep the old version around as <input.file>.old


Comment on Re: Deleting first and last lines of a text file
Download Code
Re^2: Deleting first and last lines of a text file
by vsmeruga (Acolyte) on May 16, 2014 at 09:36 UTC
    Thanks for the reply. I will try and let you know
Re^2: Deleting first and last lines of a text file
by vsmeruga (Acolyte) on May 16, 2014 at 09:47 UTC

    Hi I tried the code like this and got error as

    syntax error at ./perl_deletelines.pl line 5, near "-ne" Execution of ./perl_deletelines.pl aborted due to compilation errors. </P

    #!/usr/bin/perl use strict; use warnings; perl -i.old -ne 'print unless $.==1 or eof' /home/file_20140407.txt

      The script given to you by morgon is a oneliner, which you should "run" from your command line interface, not from your a script.
      If you want a full script of the oneliner this would do:

      BEGIN { $^I = ".old"; } LINE: while ( defined( $_ = <ARGV> ) ) { print $_ unless $. == 1 or eof; }
      putting the above in a script should work.

      Of course, morgon code works fine from the CLI.

      If you tell me, I'll forget.
      If you show me, I'll remember.
      if you involve me, I'll understand.
      --- Author unknown to me
        But where are we specifying the filename here ?. I mean from which file first and last lines has to be deleted? Thanks VJ
        Hi I should automate the task of deleting the lines in the file so that it runs every day and deletes particular file Thanks VJ

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1086269]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (8)
As of 2014-09-17 22:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (100 votes), past polls