07-15-2014
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I have file with 70 lines.
I want to add 'SLV' at the starting of the line if the line has first character as 0 or 1 or 2 or ..9
Nothing else has to be changed in the file. Please anyone advice. (5 Replies)
Discussion started by: senthil_is
5 Replies
2. Shell Programming and Scripting
Okay, title is kind of confusion, but basically, I have a lot of scripts on a server that I need to replace a ps command, however, the new ps command I'm trying to replace the current one with pipes to sed at one point. So now I am attempting to create another script that replaces that line.
... (1 Reply)
Discussion started by: cbo0485
1 Replies
3. Shell Programming and Scripting
How do i replace a string using sed into the same file without creating a intermediate file? (7 Replies)
Discussion started by: gomes1333
7 Replies
4. Shell Programming and Scripting
I have got problems saving sed changes to the same file in a loop.
Basically I want the delimited value in every line of the file to be set to blank according to the value stored in var. var can be changed anytime.
I do not have sed -i and i've tried to mv the file. Any other ideas?
My file... (8 Replies)
Discussion started by: alienated
8 Replies
5. Shell Programming and Scripting
Hi Everyone,
I am new to this forum and new to sed/awk programming too !!
I need to find particular string in file1(text file) and replace it with a value from another text file(file2) the file2 has only one line and the value to be replaced with is in the second column.
file 1:
(assert (=... (21 Replies)
Discussion started by: paramad
21 Replies
6. Shell Programming and Scripting
Hi!
I have this shell script that I need to finish. Currently I need to fix one line to make it work. I need to change a file extension. See this code, is pretty simple.
#!/bin/sh
# Extensions
OLD_EXT=.flv
NEW_EXT=.mp4
COUNT_FILES=$(ls -l *$OLD_EXT | grep ^- | wc -l)
if ; then
... (8 Replies)
Discussion started by: pulsorock
8 Replies
7. Shell Programming and Scripting
Hi guys,
Hi have this input (Menu.xml)<?xml version="1.0" encoding="ISO-8859-1"?>
<breakfast_menu>
<food>
<name>Berry-Berry Belgian Waffles</name>
<price>$8.95</price>
<calories>900</calories>
</food>
<food>
<name>French Toast</name>
... (6 Replies)
Discussion started by: cgkmal
6 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I want to use sed to replace " /// " with "///" in a text file. However I am getting error messages when I use sed 's/ /// /////g' input.txt > output.txt. How do I go about doing this in sed?
Input:
219518_s_at 0.000189 ELL3 / SERINC4
Output:
219518_s_at 0.000189 ELL3/SERINC4 (5 Replies)
Discussion started by: evelibertine
5 Replies
9. Shell Programming and Scripting
Hi Everyone,
I need some help with sed and I'm totally new to it.
I have a template file with variables in it. These variables start with a '$' sign and are exactly one character long (plus the '$' sign). For example: $a, $b, etc.
Each variable should be replaced with the contents of a... (9 Replies)
Discussion started by: csarli2006
9 Replies
10. Shell Programming and Scripting
How can I change the comma sign (,) to plus sign (+) with the sed command or any regex?
I mean to change only the comma that beteen the quotation marks.
From this file:
A,B,C
A,"B,C",D
"A,B",C,D
A,B,"C,D"
To this file:
A,B,C
A,"B+C",D
"A+B",C,D
A,B,"C+D" (6 Replies)
Discussion started by: elior
6 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)