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Full Discussion: Help on Spliting files - urgent
Top Forums Shell Programming and Scripting Help on Spliting files - urgent Post 302174120 by radoulov on Monday 10th of March 2008 06:16:27 AM
Old 03-10-2008
Quote:
Originally Posted by rajee
Hi radoulov
[...]
If you have time, please explain the code.
[...]
Code:
BEGIN {
n = split("a b c d e f g h i j k l m n o p q r s t u v w x y z", f)
c2 = c1 = c = 1 }

Prepare the f array (the alphabet) and set c,c1 and c2 to 1 and n to the number of elements in the f array.

Code:
!x[length]++ % 5

I think that an example will illustrate best this expression:

Code:
% awk '{print x[length]++%5==0?"here -->":"--------",$0}' file
here --> 22
-------- 23
-------- 25
-------- 34
-------- 37
here --> 45
-------- 67
here --> 342
-------- 456
-------- 476
-------- 543
-------- 677
here --> 789

In other words, we change the filename every time the expression x[length]++ % 5 is 0.

Now, the filename generation.

Code:
close(fn); fn = "cin"f[c2] f[c1] f[c]".in"
if ((c1 == n) && (c == n))
   c2 = c2 >= n ? 1 : ++c2
c = c >= n ? 1 : ++c
if (c == 1)
  c1 = c1 >= n ? 1 : ++c1 }

We need to close the previous file because some Awk implementations (such as Awk on Solaris) can open a limited number of files at the same time.
Then we compose the filename: the f array with rotating keys (from 1 to n, where n is the number of elements in f the array).

Code:
{ print > fn }

This simply prints into the changing filename.

Hope this helps.
 

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LEARN ABOUT CENTOS

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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