Hello,
I have never ever seen below notation for string substitution.
The strange thing for me is the position of the apostrophe. Should it be before the / or after the g?
If I had been writing that command line, I would have chosen below way:
Could you please explain what it differs...
Is that about the operating system?
Many thanks
Boris
Regular expressions uses meta-characters. These are characters that have special meaning beyond the representation of the character. The shell has also meta-characters. Therefore in order to protect the meaning of these characters it must be quoted so it gets passed to sed as the regular expression intended.
In this case the quoting could be avoided all together sed s/tttt/pppp/g /var/bin/czech.sh since there are no meta-characters.
Hello,
I'm trying to translate a fixed length (the first 6 positions) that begins with a 0 to overwrite the field with an *.
Any suggestion?
File 1
-------
013344 01:20
222343 19:30
233333 20:30
File 2 (result)
-----------------
****** 01:20
222343 19:30
233333 20:30 (5 Replies)
how can I find cpu usage memory usage swap usage and
I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times
my final destination is monitor process
logical volume usage above X % and number of Logical voluage above
can I not to... (3 Replies)
Hi all,
I need your help.
For example I have string in file.txt:
-x -a /tmp/dbarchive_NSS_20081204 -f 900 -l 1 2008/12/04 2008/12/04
So, I need to replace symbols from (for e.g.) position 26 till 33 with symbols which I have in file replace.txt
And I have no idea how to do it.
If... (1 Reply)
I want to remove text from nth position to nth position couple of times in same line
my line is
"hello is there anyone can help me with this question"
I need like this
ello is there anyone can help me with question
'h' is removed and 'this' removed from the line. I want to do this... (5 Replies)
I'm drawing a blank on how to use sed to replace selectively based on position in the string (vs nth occurence):
hello.|there.|how.|are.|you.|
I want the period removed in the 3rd item (as defined by the pipe delimiter) if a period is present. So the result in this case would be:
... (2 Replies)
I'm coding using BASH and have a requirement to replace apostrophes with backslash apostrophes. For example below:
I am here 'in my room' ok
Would be changed to:
I am here /'in my room/' ok
The original text is coming from a field in a MySql database and is being used by another process that... (5 Replies)
Hi,
I have a document with usual English text and some of the words have apostrophes (e.g. don't, can't, etc.)
I would like all these apostrophes to be doubled (e.g. don''t, can''t, etc.), but the problem is, that some of such words have double apostrophe and
by using sed -i "s/'/''/g"... (2 Replies)
Currently the table looks like this
student-id,last,first,hwk1,hwk2,hwk3,exam1,hwk4,hwk5,exam2
pts-avail,,,100,150,100,200,100,150,300
991-78-7872,Thompson,Ken,95,143,79,185,95,135,259
123-45-6789,Richie,Dennis,99,123,89,189,97,139,279
234-56-7891,Aho,Al,78,146,75,176,88,128,285... (3 Replies)
i have a requirement like this
if the line contains from position 294 to 299 is equal to "prabhu" ,then print entire line .
i want to use awk
awk '{if(substr(294-299) == 'prabhu') print "line" }' filename (1 Reply)
Thanks to help from Don Cragun in post 302924174, I'm off and getting into trouble on my own (finally) with sed.
Here is my goal - insert \\r\n at the 60th character on each line and then every 76th character thereafter:
Input:... (3 Replies)
Discussion started by: gusbrown
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)