How to add one line in the beginning of the file? Post: 302907022

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

input a line at the beginning of every file in a directory?

if need to input a word or anything at the beginning of every file in a directory. how do i accomplish this? say the file is named hyperten. how do i make hyperten the first line of every file in a given directory? thanks

2. UNIX for Dummies Questions & Answers

Adding one string at the beginning of each line in a file

Hi, I have file a.txt as below. I want to add one string root beginning of each line. Sample file a.txt aaa bbb ccc Sample output Root aaa Root bbb Root ccc Can any one help me on this?

3. Linux

Add file's date at beginning of every line in file

How would I do that? /Rutger

4. Shell Programming and Scripting

add a number to the beginning of every line

hey, i would like to add a line number to the beginning like so: red blue green yellow will be: 1=>red 2=>blue 3=>green 4=>yellowplease advise thank u.

5. Shell Programming and Scripting

trying to add text to beginning and end of each line

Well here goes: I tried to write a batch file that adds a specific fixed text to each line of an already existing text file. for the adding text infront of each line I tried this: for /F "delims=" %%j in (list.txt) do echo.STARTTEXT\%%j >> list.txt for adding text after each line I...

6. Windows & DOS: Issues & Discussions

Trying to add text to the beginning of each line

7. Shell Programming and Scripting

Append file name to the beginning of each line

I want to append file names at the beginning of a line for each row file content abc.txt.gz 123|654|987 bcd.txt.gz 876|trf|kjh I want a single output file with below format abc.txt.gz|123|654|987 bcd.txt.gz|876|trf|kjh This one is working but only with unzip files,need to have...

8. UNIX for Dummies Questions & Answers

Add word/value at the beginning of each line in a file

how to add value/word at the beginning of each line in a file ? i have file number.txt and the output is below 1000 1001 1002 1003 1004 i want to add 000 at the beginning of each line, desire output is below 0001000 0001001 0001002 0001003 0001004 and so on please advise how...

9. UNIX for Dummies Questions & Answers

sed - Add a variable line to the end of a block beginning with a regex

Hi, Need some help with sed. I have a file that has sections : e.g. a=blah b=blah d=blah e=blah There's many sections in the file.

10. Shell Programming and Scripting

Add new line at beginning and end of a file

Hi, I have a specific requirement to add text at the beginning and end of a plain text file. I tried to use "sed" with '1i' and '$a' flags but these required two separate "sed" commands separated with "|". I am looking for some command/option to join these two in single command parameter. ...

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)