@Sri3001: I see what you're tying to do here. You have something stored in variable 'a', the stored value if used as a variable will point to something else, right. Try this:
And as enunciated by jayan_jay, $$ refers to the pid of current shell. So a plain echo $$awould no doubt fetch you a pid concatenated with 'a'.
hi all...
I am executing a comman in a shell script but the command needs a user input of character 'y' as input so it stops in between...may i know is there is any way of giving that character as input in the shell script itself???...thanks in advance.... (6 Replies)
HI,
I want to know can multiple pattern be given inside a sed statement..
Input:
aa_bb_cc.Mar-22-2007
cc_dd_ee.Mar-21-2007
aa_1002985_952.xml
aa_bb_032207.txt
aa_bb_cc_10002878.dat
Output:
aa_bb_cc
cc_dd_ee
aa.xml
aa_bb.txt
aa_bb_cc.dat (6 Replies)
Hiii,
I have a requiremnt like this----
Please provide the current sever capacity and the % of utilization for each of the servers used by your respective applications.
Also please provide the list of applications running on each of the unix server
can you please help me out in this. (2 Replies)
Hello sir,
I am using "gpg" command to encrypt a file.
We generally do it :-
then it asks us for :-
I want to know how to give this Passphrase in the command line itself !!!I did read the man page but couldnt make out what is the option for it.Can u please help me out !!! (2 Replies)
How can i perform a ls or other command to list the full paths of files from a ls?
Looked through the man page for ls, no luck
$ cd /tmp/
$ ls -l
total 6
drwx------ 2 root root 4096 Nov 7 2008 keyring-7b5rMv
drwx------ 2 bcr bcr 4096 Dec 7 2007 keyring-cGhir8
$
I'd be looking for... (1 Reply)
This is my command
echo "Test" | sed -f <(sed -e 's/.*/s,&,gI/' mydic)
In mydic file,containing 2 columns delimit by comma (,)
a,AlphabetA
.
.
.
e,AlphabetE
.
.
s,AlphabetS
.
t,AlphabetT
test,testedd
.
.
zebra,zebraaaa
The expect result is testedd (0 Replies)
<?php
$comando = "kill -9 3104";
$output = shell_exec($comando);
?>
I am running this web page, but it does not execute the command, in the log file it looks like this:
sh: 1: kill: Operation not permitted
How do I give permission to execute the command? (1 Reply)
Discussion started by: Rodrigo_Bueno
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)