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Full Discussion: convert unix script to perl
Top Forums Shell Programming and Scripting convert unix script to perl Post 302178450 by era on Tuesday 25th of March 2008 01:42:01 PM
Old 03-25-2008
Quote:
Originally Posted by gholdbhurg;302178443[CODE
FILEONE = /<filepath1>/<filename1.txt>
FILENEW = /<filepath2>/<filename2.txt>
head -5 $FILEONE | sed '1d' > $FILENEW[/CODE]
Print four lines starting from line 2?

Code:
my $file1 = "/path/to/file1";
my $file2 = "/path/to/file2";

open (R, $file1) || die "Could not open $file1: $!\n";
open (W, ">$file2") || die "Could not open $file2: $!\n";
while (<R>) {
  print W unless $. == 1;
  last if $. == 5;
}
close R;
close W;

This can probably be abbreviated but if you are building a larger script, you will probably need roughly these pieces.

Quote:
Code:
PARAM1 = `cat $FILENEW | awk '{print $2;}' `
echo "Param1 Value: $PARAM1"

Create a space-separated value based on the second field of the lines in a file? This is not quite as natural in Perl but also not hard to do. I sort of fail to see any common use case for this, though.

Code:
my @g;
while (<R>) {
  my @f = split;
  push @g, $f[1];  # array indices are zero-based, so this is the second field
}
print(join (" ", @g), "\n");

Notice the use of an array to collect the values, and then a simple transform on it when you're done.

If you want to merge this with the first loop over file1, you can do something like

Code:
  print W if (2..5);
  # take out the "last"
  my @f = split;
  push @g, $f[1];

Last edited by era; 03-25-2008 at 02:47 PM.. Reason: Merging the two loops; fix indexing error (duh)
 

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LEARN ABOUT V7

join

JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME

       join - relational database operator

SYNOPSIS

       join [ options ] file1 file2

DESCRIPTION

       Join  forms,  on the standard output, a join of the two relations specified by the lines of file1 and file2.  If file1 is `-', the standard
       input is used.

       File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the  first	in
       each line.

       There  is  one line in the output for each pair of lines in file1 and file2 that have identical join fields.  The output line normally con-
       sists of the common field, then the rest of the line from file1, then the rest of the line from file2.

       Fields are normally separated by blank, tab or newline.	In this case, multiple separators count as one, and leading  separators  are  dis-
       carded.

       These options are recognized:

       -an    In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2.

       -e s   Replace empty output fields by string s.

       -jn m  Join on the mth field of file n.	If n is missing, use the mth field in each file.

       -o list
	      Each  output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a
	      field number.

       -tc    Use character c as a separator (tab character).  Every appearance of c in a line is significant.

SEE ALSO

       sort(1), comm(1), awk(1)

BUGS

       With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort.

       The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous.

																	   JOIN(1)
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