08-14-2010
growisofs will work under sudo if you unset the SUDO_COMMAND variable.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I have just found out that a project I have developed in ASP (ultradev) needs to be migrated to a unix server and won't be able to support asp. Can anyone point me in the right direction to see what my options are with Unix? I have never worked with or developed for a Unix box before.
Also,... (3 Replies)
Discussion started by: Ricki
3 Replies
2. UNIX for Advanced & Expert Users
Hi,
I need to develop timeout functionality in my code, which is not affected by system's time changes.Unfortunately I dont have CLOCK_MONOTONIC support in my OS.
Are there any alternatives? (3 Replies)
Discussion started by: amitks21
3 Replies
3. Linux
Hi folks,
Any folk has experience on ntop/Nmon
ntop - network top
and its spinoff NMON
Welcome to nmon.net
Nmon
Nmon - Wikipedia, the free encyclopedia
nmon for AIX and Linux Performance Monitoring
IBM Wikis - AIX 5L Wiki - nmon
A free tool to analyze AIX and Linux... (5 Replies)
Discussion started by: satimis
5 Replies
4. Shell Programming and Scripting
Hi,
I am using rsync to copy files and links from one server to other (backup server).
The problem with rsync is that it is not copying the files and links in the order which i have mentioned.
It is sorting in alphabetical order before it is copying the files and links.
I want a utilty that... (1 Reply)
Discussion started by: vvenu88
1 Replies
5. Shell Programming and Scripting
I am writing a BASH script to update a webserver and then restart Apache. It looks basically like this:
#!/bin/bash
rsync /path/on/local/machine/ foo.com:path/on/remote/machine/
ssh foo.com sudo /etc/init.d/apache2 reloadrsync and ssh don't prompt for a password, because I have DSA encryption... (9 Replies)
Discussion started by: fluoborate
9 Replies
6. Shell Programming and Scripting
I have a list of items (control file) that I want to substitute in a text file, and it's BIG.
The file has two items, the original, and the new:
A B
B C
D E
The file has something like 10,000 entries.
So in the oldfile.txt, I'd like to basically make all these expression matched... (9 Replies)
Discussion started by: twoblink
9 Replies
7. UNIX for Advanced & Expert Users
Hi,
I am using SSH to execute unix commands on remote machines. But, SSH will be diabled soon and I am looking for other alternatives to execute remote scripts/commands, without SSH . any suggestions or workarounds with out SSH for remote program executions ?
Thanks in advance. (4 Replies)
Discussion started by: talashil
4 Replies
8. Shell Programming and Scripting
Are there any other alternatives to using Expect script? Can functionality provided by Expect be achieved by any other scripting language? (7 Replies)
Discussion started by: indianya
7 Replies
9. UNIX for Dummies Questions & Answers
Hi is there an alternative other than the find command to get the size of files which are 10 days older ? I already use a script with find command
find . -mtime +10.
However would want to have an alternative script to find the size of files which are over 10 days.
Let me know if you... (1 Reply)
Discussion started by: venkidhadha
1 Replies
10. Shell Programming and Scripting
I'm adapting a BASH script to run with an absolute minimal amounts of Cygwin64 files so colleagues using Windows can use it without installing Cygwin.
I am down to the following in /bin only (replacing cut with parameter substitution eliminated all needed things in /etc)
bash.exe
cygattr-1.dll... (5 Replies)
Discussion started by: Michael Stora
5 Replies
UNSET(3) 1 UNSET(3)
unset - Unset a given variable
SYNOPSIS
void unset (mixed $var, [mixed $...])
DESCRIPTION
unset(3) destroys the specified variables.
The behavior of unset(3) inside of a function can vary depending on what type of variable you are attempting to destroy.
If a globalized variable is unset(3) inside of a function, only the local variable is destroyed. The variable in the calling environment
will retain the same value as before unset(3) was called.
<?php
function destroy_foo()
{
global $foo;
unset($foo);
}
$foo = 'bar';
destroy_foo();
echo $foo;
?>
The above example will output:
bar
To unset(3) a global variable inside of a function, then use the $GLOBALS array to do so:
<?php
function foo()
{
unset($GLOBALS['bar']);
}
$bar = "something";
foo();
?>
If a variable that is PASSED BY REFERENCE is unset(3) inside of a function, only the local variable is destroyed. The variable in the
calling environment will retain the same value as before unset(3) was called.
<?php
function foo(&$bar)
{
unset($bar);
$bar = "blah";
}
$bar = 'something';
echo "$bar
";
foo($bar);
echo "$bar
";
?>
The above example will output:
something
something
If a static variable is unset(3) inside of a function, unset(3) destroys the variable only in the context of the rest of a function. Fol-
lowing calls will restore the previous value of a variable.
<?php
function foo()
{
static $bar;
$bar++;
echo "Before unset: $bar, ";
unset($bar);
$bar = 23;
echo "after unset: $bar
";
}
foo();
foo();
foo();
?>
The above example will output:
Before unset: 1, after unset: 23
Before unset: 2, after unset: 23
Before unset: 3, after unset: 23
PARAMETERS
o $var
- The variable to be unset.
o $...
- Another variable ...
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
unset(3) example
<?php
// destroy a single variable
unset($foo);
// destroy a single element of an array
unset($bar['quux']);
// destroy more than one variable
unset($foo1, $foo2, $foo3);
?>
Example #2
Using (unset) casting
(unset) casting is often confused with the unset(3) function. (unset) casting serves only as a NULL-type cast, for completeness. It
does not alter the variable it's casting.
<?php
$name = 'Felipe';
var_dump((unset) $name);
var_dump($name);
?>
The above example will output:
NULL
string(6) "Felipe"
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Note
It is possible to unset even object properties visible in current context.
Note
It is not possible to unset $this inside an object method since PHP 5.
Note
When using unset(3) on inaccessible object properties, the __unset() overloading method will be called, if declared.
SEE ALSO
isset(3), empty(3), __unset(), array_splice(3).
PHP Documentation Group UNSET(3)