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Full Discussion: awk script to return the middle line number
Top Forums Shell Programming and Scripting awk script to return the middle line number Post 302509490 by jontjioe on Thursday 31st of March 2011 12:14:37 AM
Old 03-31-2011
Chubler_XL,

Sorry I'm not sure but maybe I didn't explain it clearly. I will only be doing this on one file at a time. I just listed 2 files as 2 separate examples. I tried using the code you put with one file and nothing showed up on the screen. Pardon my ignorance. Can you clarify?

Thanks!

---------- Post updated at 09:14 PM ---------- Previous update was at 09:12 PM ----------

Quote:
Originally Posted by kurumi
Ruby(1.9+)
Code:
$ ruby -0777 -ne 's=$_.split("\n"); puts (s.size%2==0)? s[(s.size/2)-1]:s[s.size/2] ' file

kurumi,

Thank you for the help, but I would like to keep it in awk or bash if possible.
 

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LEARN ABOUT V7

truncate

TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specified size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is	larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

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

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

       -o, --io-blocks
	      treat SIZE as number of IO blocks instead of bytes

       -r, --reference=RFILE
	      base size on RFILE

       -s, --size=SIZE
	      set or adjust the file size by SIZE bytes

       --help display this help and exit

       --version
	      output version information and exit

       The SIZE argument is an integer and optional unit (example: 10K is 10*1024).  Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow-
       ers of 1000).

       SIZE  may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
       down to multiple of, '%' round up to multiple of.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report truncate translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/truncate>
       or available locally via: info '(coreutils) truncate invocation'

GNU coreutils 8.28						   January 2018 						       TRUNCATE(1)
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