hi, I'm completely new to FreeBds or unix in general, is there a really nice site to teach you the basic ommands to free BSD.
I don't know what to do. =( (3 Replies)
anyone know the command to display the ten most common words, together with their number of occurences, in the manual entry for the ls command. It would be much useful (1 Reply)
Hello all,
i've written a small piece of code that will read commands from standard input and executes the commands.
Its working fine and is execting the commands well. Accepting arguments too. e.g
#mkdir <name of the directory>
The problem is that its not letting me change the directory i.e... (4 Replies)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Hi all,
I'm new in this forum.
I'm looking for the difference between the HACMP commands with the prefix "cl" and "cli".
The first type are under /usr/es/sbin/cluster/sbin directory and the second are under /usr/es/sbin/cluster/cspoc directory.
I know that the first are called HACMP for AIX... (0 Replies)
Hi!
i'd like from someone to explain me 'what is what' from these parts of code if it's possible.i'd like to understand them and their usage:
1)
sed '3d' filename
2)
sort –t: +0 -1 /etc/passwd
and also this:
tr ‘’ ‘ ‘ < filename
thank you! (11 Replies)
I'm trying to figure out certain commands for these steps. If you wish to discuss with me in real time, PM me your AIM or MSN, thanks. Here are the steps.
Edit the readcal_final file
Delete all of the lines that comprise the colandar portion of the memo
Without leaving vi, open a new... (0 Replies)
How can I find a list of shortcut commands I can execute within vi using the % indicator?
For example, I can vi a file, press colon, and then type "%s/\r//g" to remove all instances of a carriage return. What else can be executed from the % prompt and what are the shortcut letters (I could type... (4 Replies)
So I need a way to list all files that contain 4 letters.
Also separately I need to find a way to list all files with l or n as the third letter of the name.
I need to use the ls command and/or grep/egrep.
Any help would be a appreciated. (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
If the user enters option 1, your program should display the list of entries in the current
directory. For... (1 Reply)
Discussion started by: UniverseCloud
1 Replies
LEARN ABOUT PHP
eval
EVAL(3) 1 EVAL(3)eval - Evaluate a string as PHP codeSYNOPSIS
mixed eval (string $code)
DESCRIPTION
Evaluates the given $code as PHP.
Caution
The eval(3) language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged.
If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user
provided data into it without properly validating it beforehand.
PARAMETERS
o $code
- Valid PHP code to be evaluated. The code mustn't be wrapped in opening and closing PHP tags, i.e. 'echo "Hi!";' must be passed
instead of '<? echo "Hi!"; >'. It is still possible to leave and reenter PHP mode though using the appropriate PHP tags, e.g.
'echo "In PHP mode!"; ?>In HTML mode!<? echo "Back in PHP mode!";'. Apart from that the passed code must be valid PHP. This
includes that all statements must be properly terminated using a semicolon. 'echo "Hi!"' for example will cause a parse error,
whereas 'echo "Hi!";' will work. A return statement will immediately terminate the evaluation of the code. The code will be exe-
cuted in the scope of the code calling eval(3). Thus any variables defined or changed in the eval(3) call will remain visible
after it terminates.
RETURN VALUES eval(3) returns NULL unless return is called in the evaluated code, in which case the value passed to return is returned. If there is a
parse error in the evaluated code, eval(3) returns FALSE and execution of the following code continues normally. It is not possible to
catch a parse error in eval(3) using set_error_handler(3).
EXAMPLES
Example #1
eval(3) example - simple text merge
<?php
$string = 'cup';
$name = 'coffee';
$str = 'This is a $string with my $name in it.';
echo $str. "
";
eval("$str = "$str";");
echo $str. "
";
?>
The above example will output:
This is a $string with my $name in it.
This is a cup with my coffee in it.
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Tip
As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
this function, and save it in a string (for example).
Note
In case of a fatal error in the evaluated code, the whole script exits.
SEE ALSO call_user_func(3).
PHP Documentation Group EVAL(3)