hey guys, how do i replace only a line within a file without messing up the rest of the contents of the file?
see, if possible can you guys give me a straight forward way to do this. i dont want a complex command. what i mean is i know i can accomplish this by using sed, well, i think i can,... (3 Replies)
are there any basic commands that can display lines 99 - 101 of the /etc/passwd file?
I'm thinking use of head and tail, but I forget what numbers to use and where to put /etc/passwd in the command. (2 Replies)
Dear All,
Regards of the Day.
I have a text file with some functions:
Function1
{
parameter 1
parameter 2
parameter 3
}
end
Function2
{
parameter 1
parameter 2
parameter 3
} (1 Reply)
Hi,
I know there are lots of threads on replacing text within files, usually using sed or awk. However, I find it hard to adapt examples that I found to my specific case. I am kind of new to UNIX and have hard times learning the syntax either for sed or awk so I would appreciate any help. Here's... (5 Replies)
I have a space delimited text file where I want to replace all cells that are 0 with NA. However I cannot simply use 'sed/0/NA/g' because there are other 0's in the text file that are part of numbers.
Example input:
896.933464285715
0
874.691732142857
866.404660714286
Output:... (1 Reply)
Hi,
I have a file with many lines,
then i have following list of lines(line number 5,12,19,5,and 28) i need to replace these lines of a file with another lines as shown below these text
contains special charecter like= (/:;){}
Line_number Text to replace with
5 abc... (1 Reply)
Hi friends,
This is sed & awk type question.
I have a text file which has numbers spread all over the file. I want to sum the series of numbers whenever i find it and produce an output file with the sum. For example
###start of input text file ####
abc
def
ghi
1
2
3
4
kjld
random... (3 Replies)
Hi friends,
This is sed & awk type question. It is slightly different from my previous question.
I have a text file which has numbers spread all over the file. I want to sum the series of numbers (but no more than 10 numbers in series) whenever i find it and produce an output file with the... (4 Replies)
This could be a really dummy question.
I have a log text file.
What unix command to extract line from specific string to another specific string.
Is it something similar to?:
more +/"string" file_name
Thanks (4 Replies)
Here is the task that I was presented with:
I am dealing with about a 10,000 line input deck file for an analysis. About 10 separate blocks of around 25 lines of code each need to be updated in the input deck.
The input deck (deckToChange in the code below) comes with 2 separate files. File 1... (5 Replies)
Discussion started by: tiktak292
5 Replies
LEARN ABOUT PHP
debug_zval_dump
DEBUG_ZVAL_DUMP(3) 1 DEBUG_ZVAL_DUMP(3)debug_zval_dump - Dumps a string representation of an internal zend value to outputSYNOPSIS
void debug_zval_dump (mixed $variable, [mixed $...])
DESCRIPTION
Dumps a string representation of an internal zend value to output.
PARAMETERS
o $variable
- The variable being evaluated.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
debug_zval_dump(3) example
<?php
$var1 = 'Hello World';
$var2 = '';
$var2 =& $var1;
debug_zval_dump(&$var1);
?>
The above example will output:
&string(11) "Hello World" refcount(3)
Note
Beware the refcount
The refcount value returned by this function is non-obvious in certain circumstances. For example, a developer might expect the
above example to indicate a refcount of 2. The third reference is created when actually calling debug_zval_dump(3).
This behavior is further compounded when a variable is not passed to debug_zval_dump(3) by reference. To illustrate, consider a
slightly modified version of the above example:
Example #2
<?php
$var1 = 'Hello World';
$var2 = '';
$var2 =& $var1;
debug_zval_dump($var1); // not passed by reference, this time
?>
The above example will output:
string(11) "Hello World" refcount(1)
Why refcount(1)? Because a copy of $var1 is being made, when the function is called.
This function becomes even more confusing when a variable with a refcount of 1 is passed (by copy/value):
Example #3
<?php
$var1 = 'Hello World';
debug_zval_dump($var1);
?>
The above example will output:
string(11) "Hello World" refcount(2)
A refcount of 2, here, is extremely non-obvious. Especially considering the above examples. So what's happening?
When a variable has a single reference (as did $var1 before it was used as an argument to debug_zval_dump(3)), PHP's engine opti-
mizes the manner in which it is passed to a function. Internally, PHP treats $var1 like a reference (in that the refcount is
increased for the scope of this function), with the caveat that if the passed reference happens to be written to, a copy is made,
but only at the moment of writing. This is known as "copy on write."
So, if debug_zval_dump(3) happened to write to its sole parameter (and it doesn't), then a copy would be made. Until then, the
parameter remains a reference, causing the refcount to be incremented to 2 for the scope of the function call.
SEE ALSO var_dump(3), debug_backtrace(3), References Explained, References Explained (by Derick Rethans).
PHP Documentation Group DEBUG_ZVAL_DUMP(3)