Well its not expected to work since you initially asked for "I am looking for an option in perl using which i could delete empty lines in a file." and now "i have to get the last non empty line into the variable". Make up your mind before you ask. This should work:
Hi all,
I know the one liner to delete all the lines in a file which matches a pattern
i.e
perl -i.old -ne 'print unless /pattern/' file
Now i need the perl onliner to delete all the lines which doesnt match the pattern. Also what is the difference between perl -i and perl -i.old.
Does... (1 Reply)
I have a file which has the first blank line:
sundev22$cat /t1/bin/startallocs
/t1/bin/startallocsys 123
sundev22$
Is there a command to remove this first blank line? Thanks for help -A (4 Replies)
i have a file called Cleaner1.log . This files have some blank lines also.My requirement is that it should ignore the blank lines and give me the lines that contain some data.
I m using this logic in a script:
below the contents of file :
Maximum Time Taken for Processing(Failed) RR... (4 Replies)
I have a number of files (arranged in directories) which have last line blank,
I am trying to synchronize my code with other env and due to this blank lines, all files error out as different although only difference is that of balnk line at end of file.
Is there a way I can recursively... (2 Replies)
I want to get the blank line number of a file.
example:
9000|9000|WW|1|1|SL|472|472|LC|2272|1072|MTY|niceDay
9000|9000|WW|1|1|SL|470|470|MC|1270|1172|MPVT|nice
9000|9000|WW|1|1|SL|472|472|LC|1072|1672|MBD|Sonice
9000|9000|WW|1|1|SL|473|473|LF|1173|1173|MTY|nice666
I want to get... (5 Replies)
Hi
I nned cmd to which will help me to replace a line in file with blank line
e.g.
file1
a
b
c
d
e
after running cmd I shud get
file1
b
c
d
e (5 Replies)
Hi Guys,
I have a file in which each set of records are separated by two blank line. I want to replace it with a single blank line.
Can you guys help me out?
Regards,
Magesh (9 Replies)
Dear All,
In a CSV file, say that a given column has been extracted. In that column, information is missing (i.e. blank lines appear). I would like to replace the blank lines by the last valid line (not blank) previously read.
For example, consider the extract below:
123
234
543
111... (7 Replies)
Statistics::Basic::Variance(3pm) User Contributed Perl Documentation Statistics::Basic::Variance(3pm)NAME
Statistics::Basic::Variance - find the variance of a list
SYNOPSIS
Invoke it this way:
my $variance = variance(1,2,3);
Or this way:
my $v1 = vector(1,2,3);
my $var = var($v1);
And then either query the values or print them like so:
print "The variance of $v1: $variance
";
my $vq = $var->query;
my $v0 = 0+$var;
Create a 20 point "moving" variance like so:
use Statistics::Basic qw(:all nofill);
my $sth = $dbh->prepare("select col1 from data where something");
my $len = 20;
my $var = var()->set_size($len);
$sth->execute or die $dbh->errstr;
$sth->bind_columns( my $val ) or die $dbh->errstr;
while( $sth->fetch ) {
$var->insert( $val );
if( defined( my $v = $var->query ) ) {
print "Variance: $v
";
}
# This would also work:
# print "Variance: $v
" if $var->query_filled;
}
METHODS
new()
The constructor takes a list of values, a single array ref, or a single Statistics::Basic::Vector as arguments. It returns a
Statistics::Basic::Variance object.
Note: normally you'd use the mean() constructor, rather than building these by hand using "new()".
query_mean()
Returns the Statistics::Basic::Mean object used in the variance computation.
_OVB::import()
This module also inherits all the overloads and methods from Statistics::Basic::_OneVectorBase.
AUTHOR
Paul Miller "<jettero@cpan.org>"
I am using this software in my own projects... If you find bugs, please please please let me know. :) Actually, let me know if you find it
handy at all. Half the fun of releasing this stuff is knowing that people use it.
OVERLOADS
This object is overloaded. It tries to return an appropriate string for the calculation or the value of the computation in numeric
context.
In boolean context, this object is always true (even when empty).
COPYRIGHT
Copyright 2012 Paul Miller -- Licensed under the LGPL
SEE ALSO perl(1), Statistics::Basic, Statistics::Basic::_OneVectorBase, Statistics::Basic::Vector
perl v5.14.2 2012-01-23 Statistics::Basic::Variance(3pm)