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Full Discussion: Perl split and array
Top Forums Shell Programming and Scripting Perl split and array Post 302932726 by Zam_1234 on Friday 23rd of January 2015 06:17:04 PM
Old 01-23-2015
Computer Perl split and array

Hello, I have the following code:
Code:
 while ($line = <fd_in>) {
   126    $line = " " . $line ;
   127  print "our_line:$line\n";
   128    @list = split (/\s+/, $line) ;
   129  print "after_split:@list\n";
   130  print "$list[0]\t$list[1]\t$list[2]\t$list[3]\t$list[4]\t$list[5]$list[6]\t\n";
   131    $len = $#list ;
   132  print "length of array:$len\n";
   133
   134
   135    if (($len >= 7) && ($list[3] ne "total")) { # Ignore header and totals
   136      $cpu_id = $list[2] ;
   137      print "$list[0]\t$list[1]\t$list[2]\t$list[3]\t$list[4]\n";
   138      print "cpu_id: $cpu_id\n";
   139      $pic0 = $list[4] ;
   140      print "pic0: $pic0\n";
   141      $pic1 = $list[5] ;

And when I ran the code, here is one of the output:
Code:
our_line:   1.023  25  tick         8       635  # pic0=L2_dmiss_ld,pic1=Instr_cnt

after_split: 1.023 25 tick 8 635 # pic0=L2_dmiss_ld,pic1=Instr_cnt
        1.023   25      tick    8       635#
length of array:7
        1.023   25      tick    8
cpu_id: 25
pic0: 8

What I am not getting is, line 127 is printing out the whole array and then the "split" is splitting the array based on one or more spaces (I might be wrong, but the output shows like that).
But then in the code line 130, I am trying to print all the elements of the array which is not making sense. It is not printing out all the elements.

Later, line 136 is taking cpu_id as 3rd element of the array ($list[2]), but it should be $list [1]. I am not sure how it is working and might be missing the clue.

Any help is much appreciated.
 

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fmt(1)								   User Commands							    fmt(1)

NAME
fmt - simple text formatters SYNOPSIS
fmt [-cs] [-w width | -width] [inputfile...] DESCRIPTION
fmt is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the -w width option. The default width is 72. fmt concatenates the inputfiles listed as arguments. If none are given, fmt formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. fmt does not fill nor split lines beginning with a `.' (dot), for compatibility with nroff(1). Nor does it fill or split a set of contiguous non-blank lines which is determined to be a mail header, the first line of which must begin with "From". Indentation is preserved in the output, and input lines with differing indentation are not joined (unless -c is used). fmt can also be used as an in-line text filter for vi(1). The vi command: !}fmt reformats the text between the cursor location and the end of the paragraph. OPTIONS
-c Crown margin mode. Preserve the indentation of the first two lines within a paragraph, and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. -s Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such formatted text, from being unduly combined. -w width | -width Fill output lines to up to width columns. OPERANDS
inputfile Input file. ENVIRONMENT VARIABLES
See environ(5) for a description of the LC_CTYPE environment variable that affects the execution of fmt. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
nroff(1), vi(1), attributes(5), environ(5) NOTES
The -width option is acceptable for BSD compatibility, but it may go away in future releases. SunOS 5.10 9 May 1997 fmt(1)
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