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Top Forums Shell Programming and Scripting How to process from middle of a file? Post 302155027 by ramen_noodle on Wednesday 2nd of January 2008 05:21:46 PM
Old 01-02-2008
Code:
a=`wc -l bigfile.txt | awk '{print $1}'` ; awk -v len=$a 'BEGIN {print len / 2} NR >= (len / 2)  {print}' bigfile.txt

 

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STRINGS(1)						       GNU Development Tools							STRINGS(1)

NAME
strings - print the strings of printable characters in files. SYNOPSIS
strings [-afov] [-min-len] [-n min-len] [--bytes=min-len] [-t radix] [--radix=radix] [-e encoding] [--encoding=encoding] [-] [--all] [--print-file-name] [--target=bfdname] [--help] [--version] file... DESCRIPTION
For each file given, GNU strings prints the printable character sequences that are at least 4 characters long (or the number given with the options below) and are followed by an unprintable character. By default, it only prints the strings from the initialized and loaded sec- tions of object files; for other types of files, it prints the strings from the whole file. strings is mainly useful for determining the contents of non-text files. OPTIONS
-a --all - Do not scan only the initialized and loaded sections of object files; scan the whole files. -f --print-file-name Print the name of the file before each string. --help Print a summary of the program usage on the standard output and exit. -min-len -n min-len --bytes=min-len Print sequences of characters that are at least min-len characters long, instead of the default 4. -o Like -t o. Some other versions of strings have -o act like -t d instead. Since we can not be compatible with both ways, we simply chose one. -t radix --radix=radix Print the offset within the file before each string. The single character argument specifies the radix of the offset---o for octal, x for hexadecimal, or d for decimal. -e encoding --encoding=encoding Select the character encoding of the strings that are to be found. Possible values for encoding are: s = single-7-bit-byte characters (ASCII, ISO 8859, etc., default), S = single-8-bit-byte characters, b = 16-bit bigendian, l = 16-bit littleendian, B = 32-bit bigen- dian, L = 32-bit littleendian. Useful for finding wide character strings. --target=bfdname Specify an object code format other than your system's default format. -v --version Print the program version number on the standard output and exit. SEE ALSO
ar(1), nm(1), objdump(1), ranlib(1), readelf(1) and the Info entries for binutils. COPYRIGHT
Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. binutils-2.15.97 2005-04-20 STRINGS(1)
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