Hi, i was looking for unix command(s) for :
find the first occurrence of a given pattern with in a file and print the remaining part.
below is an example of what i am looking for:
lets say, a file named myfile.txt
now, the command i am looking for will do the following (4 Replies)
Hi,
I have two files. 1st file has 1 column (huge file containing ~19200000 lines) and 2nd file has 2 columns (small file containing ~6000 lines).
#################################
huge_file.txt
a
a
ab
b
##################################
small_file.txt
a 1.5
b 2.5
ab ... (4 Replies)
I have a file with very specific column spacing formatting,
I wish to do the following:
awk '{print $1, $2, $3, $4, $5, $6, $19-$7, $20-$8, $21-$9, $10, $11, $12}' merge.pdb > vector.pdb
but the format gets ruined.
I have tried with print -f but to no avail.... (7 Replies)
Hi All,
I have to match each row in file 1 with 1st row in file 2 and print the corresponding column from file2. I am trying to use an awk script to do this. For example
cat File1
X1
X3
X4
cat File2
ID X1 X2 X3 X4
A 1 6 2 1
B 2 7 3 3
C 3 8 4 1
D 4 9 1 1 (3 Replies)
Hello,
I have two files
File 1 with 10 columns
rsid position ........
xx 1:10000
File 2
position
1:10000
2:2000
....
I need to extract the IDs given in file 2(column1) from file 1 (column2) and print all columns from file1. I am trying this command (1 Reply)
Hello, I have two tab files with headers
File1: with 4 columns
header1 header2 header3 header4
44 a bb 1
57 c ab 4
64 d d 5
File2: with 26 columns
header1.. header5 header6 header7 ... header 22...header26
id1 44 a bb
id2 57 ... (6 Replies)
I have two text files. File 1 has 150 ids but all the ids exists in duplicates so it has 300 ids in total. File 2 has 1500 ids but all exists in duplicates so file 2 has 300 ids in total. i want to match the first occurance of every id in file 1 with first occurance of thet id in file 2 and 2nd... (2 Replies)
In the awk below I am trying to output those lines that Match between file1 and file2, those Missing in file1, and those missing in file2. Using each $1,$2,$4,$5 value as a key to match on, that is if those 4 fields are found in both files the match, but if those 4 fields are not found then missing... (0 Replies)
Discussion started by: cmccabe
0 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)