Hello all,
I have 2 files, the first (indexFile1) contains start offset and length for each record inside the second file. The second file can be very large, each actual record start offset and length is defined by the entry in indexFile1. Since there are no records separators wc-l returns 0 for... (1 Reply)
I have an extremely large csv file that I need to search the second field, and upon matches update the last field...
I can pull the line with awk.. but apparently you cant use awk to directly update the file? So im curious if I can use sed to do this... The good news is the field I want to... (5 Replies)
I have a 500 MB XML file from a FileMaker database export, it's formatted horribly (no line breaks at all). The node structure is basically
<FMPXMLRESULT>
<METADATA>
<FIELD att="............." id="..."/>
</METADATA>
<RESULTSET FOUND="1763457">
<ROW att="....." etc="....">
... (16 Replies)
Hello gurus,
I am new to "awk" and trying to break a large file having 4 million records into several output files each having half million but at the same time I want to keep the similar key records in the same output file, not to exist accross the files.
e.g. my data is like:
Row_Num,... (6 Replies)
Hi all,
I need a script to delete a large set of files from a directory under / based on an input file and want to redirect errors into separate file.
I have already prepared a list of files in the input file.
Kndly help me.
Thanks,
Prash (36 Replies)
Hi All,
I have a very large single record file.
abc;date||bcd;efg|......... pqr;stu||record_count;date
when i do wc -l on this file it gives me "0" records, coz of missing line feed.
my problem is there is an extra pipe that is coming at the end of this record
like... (6 Replies)
Dear Users,
Appreciate your help if you could help me with splitting a large file > 1 million lines with sed or awk. below is the text in the file
input file.txt
scaffold1 928 929 C/T +
scaffold1 942 943 G/C +
scaffold1 959 960 C/T +... (6 Replies)
I have files named with different prefixes. From each I want to extract the first line containing a specific string, and then print that line along with the prefix.
I've tried to do this with a while loop, but instead of printing the prefix I print the first line of the file twice.
Files:... (3 Replies)
I have a file that I'm trying to place into a variable.
I've tried the following:
DATE=`date +%Y%m%d`
filez=$(cat /tmp/Test_$DATE.txt)DATE=`date +%Y%m%d`
filez=$(</tmp/Test_$DATE.txt)DATE=`date +%Y%m%d`
filez=$(`cat /tmp/Test_$DATE.txt`)None of these lines allows the file to go into the... (3 Replies)
I have a file size is around 24 G with 14 columns, delimiter with "|"
My requirement- can anyone provide me the fastest and best to get the below results
Number of records of the file
First column and second Column- Unique counts
Thanks for your time
Karti
------ Post updated at... (3 Replies)
Discussion started by: kartikirans
3 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)