Guys im using bash and for me i think its the best shell, anyway which conf file related to bash ? is it $SHELL or .profile i want to add path to it so i dont need to type the full path of the binary file, i also want to configure the behaviour of the shell, please help. (1 Reply)
Hi All,
I have a requirement to parse a file.
Let me clear you all on the req.
I have a job which contains multiple tasks and each task will have multiple attributes that will be in the below format. Each task will have some sequence number according to that sequence number tasks shld... (0 Replies)
Hi,
I want to use a config file as the base file and parse over the values of country and city parameters in the config file and generate separate config files as explained below.
I will be using the config file as mentioned below:
(config.txt)
country:a,b
city:1,2
type:b1... (1 Reply)
Hi all, I've done some searching here but haven't found exactly what I'm looking for so I thought I'd post up and see if someone can help out.
I'm working on a shell script that I would like to store environment variables in an external file. I'm familiar with sourcing a file with variables in... (1 Reply)
Hi,
i'm trying to parse a config file that have alot of rows similar to this one:
Example value value value
What i want to do is to split and save the row above in a hash, like this:
Example = value value value
Basically i want to split on the first whitespace after the first... (3 Replies)
Hi -
I am trying to do a simple config file with known variable names in it, e.g.:
contents of config file a.conf: -a
-b $work
-c $host
simplified contents of bash script file: work='trunk'
host='alaska'
opts=$(tr '\n' ' ' < a.conf)
opts="$opts $*"
mycommand $opts arg1 arg2
The... (3 Replies)
Hi
I'm just messing around with bash and trying to learn it because I have a course next semester dealing with OS design where we need to know how to use SSH client and either bash or ksh. I've never done shell scripting before.
I just started today and I was wondering how parsing files... (1 Reply)
Hello All,
I have the following input file that i'm trying to parse:
10.0.011.40
hadoop 15526 15524 0
hadoop 15528 15526 0
hadoop 19747 4018 1
10.0.081.227
hadoop 2862 2861 0
hadoop 2864 2862 0
hadoop 12177 14376 1
I'm trying to get this in my output file:
10.0.011.40 15526 15528... (2 Replies)
I just want to make sure I am understanding how to pass a config file to a bash script . In the below I pass to arguments to a script, then define them in the script as id and config. I then source config using ., if I understand correctly the variables in the config file can now be used by the... (11 Replies)
Discussion started by: cmccabe
11 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)