12-12-2011
You can't use || inside [ ]. Use -o.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
#! /bin/bash
head -5 $1
echo "remove $1 ?"
read answer
if
then
echo invalid answer
elif
rm $1
echo "$1 is deleted"
elif
then
echo file is not deleted
else
echo "invalid answer"
fi
What i really want this to do is to ask to delete the file or not..it says something wrong... (1 Reply)
Discussion started by: nadman123
1 Replies
2. Shell Programming and Scripting
#! /bin/bash
USAGE=" | ]
if
then
echo "$USAGE"
exit 1
fi
while getopts lb: OPTION
do
case $(OPTION)in
a) echo Hi there!
exit 2;;
b) echo hello
o) OARG=$OPTARG;;
\?)echo "$USAGE" ;;
exit 2;;
esac
done
shift `expr... (1 Reply)
Discussion started by: nadman123
1 Replies
3. Shell Programming and Scripting
ls -ld | grep $1 /etc/passwd | cut -d: -f6
i need see the content... (4 Replies)
Discussion started by: nadman123
4 Replies
4. UNIX for Dummies Questions & Answers
if
then
if
then
echo "fst argument is $1 "
else
if
then
"fst argument is $1"
fi
fi
fi
Can anyone tell me. My requirement is tht pass a string ..
Check whether it contains "-". If yes then check if it... (1 Reply)
Discussion started by: nehagupta2008
1 Replies
5. Shell Programming and Scripting
I have a file $I_FILE that I need to filter and store the 1st and the 9th columns in another file $O_FILE.
With this in Perl,
system ("awk -F, '{print \$1, \$9}' \$I_FILE | sed '\/^\$\/d' > O_FILE");
I get:
4096045055
The first line in I_FILE is:... (5 Replies)
Discussion started by: looza
5 Replies
6. UNIX for Dummies Questions & Answers
can anyone tell me why this code doesn't work how its supposed to, its the hangman game but it doesn't play how its supposed to
#!/bin/bash
NoAttempts="0"
livesgiven="5"
LivesRemain=$livesgiven
LettersAttempted=""
wordfile=words
numwords=0
function menu()
{
clear
cat << menu... (1 Reply)
Discussion started by: ferrycorsten73
1 Replies
7. Shell Programming and Scripting
Code:
#!/usr/bin/perl -w
use strict;
use warnings;
#Clears Screen
$CLEAR=`clear`;
print $CLEAR;
i get the below error:
Global symbol "$CLEAR" requires explicit package name at ./mutmg.pl line 6.
Global symbol "$CLEAR" requires explicit package name at ./mutmg.pl line 7. (1 Reply)
Discussion started by: sophos
1 Replies
8. Shell Programming and Scripting
Need your assistance, to find the bug in the function.
Function usage erroring out even after passing parameters.
usage() {
if || ; then
echo "************************************************************"
echo " CHECK USAGE FOR CORRECT PARAMETERS ... (26 Replies)
Discussion started by: raghunsi
26 Replies
9. Homework & Coursework Questions
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:
ls -ld htdocs
drwxr-x--- 3 root root 8192 2006-11-19 10:41 htdocs
How would a host administrator... (1 Reply)
Discussion started by: Larry_1
1 Replies
10. Shell Programming and Scripting
Hi there,
i have a problem i have created followning sh files some years ago but now it dosen`t work anymore i never used it a long time. Can anyone find the Error? Its always runs the stop() block and trying to Killing the Server also if i try to start or creat a new one.
#!/bin/sh
stop()... (6 Replies)
Discussion started by: NewCannon
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)