12-08-2006
Ok,fine .Its working.But when i am trying to use the result in another calculation its not giving the proper result.
x='hello'
y=$(echo $x | wc -c)
echo $y
z='expr $y + 1 '
echo $z
Its printing expr $y + 1 instead of 7.
any idea pls.
cheers
Ravi Raj kumar
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
HI
I am trying to store the output of this awk command
awk -F, {(if NR==2) print $1} test.sr
in a variable when I am trying v= awk -F, {(if NR==2) print $1} test.sr
$v = awk -F, {(if NR==2) print $1} test.sr
but its not working out .
Any suggestions
Thanks
Arif (3 Replies)
Discussion started by: mab_arif16
3 Replies
2. Shell Programming and Scripting
Hi all,
I'm creating a script which uses 'defaults read' to retrieve details from an Info.plist like this;
defaults read "/Path/Contents/Info" CFBundleShortVersionString
This works fine in Terminal and returns the expected values.
Is it possible to use this command in a script, and... (0 Replies)
Discussion started by: davewg
0 Replies
3. UNIX Desktop Questions & Answers
Hi,
i have some files in one directory(say some sample dir) whose names will be like the following.
some_file1.txt
some_file2.txt.
i need to get the last modified file size based on file name pattern like some_
here i am able to get the value of the last modified file size using the... (5 Replies)
Discussion started by: eswarreddya
5 Replies
4. UNIX for Dummies Questions & Answers
I'm sure this is a simple thing but I can't figure it out. In a script that I'm writing, I'd like to be able to store each line of output from "ls -l" into a variable. Ultimately I'd like to end up with something like:
for a in `ls -l`
do something with $a
doneBut that's reading each... (2 Replies)
Discussion started by: ewoods
2 Replies
5. Shell Programming and Scripting
Hi All,
Hope someone can advise here as I have been struggling to find a syntax that works here. I have tried a stack of combination I have seed in the forums but I think because I have needed to use "" and `` in the statments another method is found.
I am reading in lines with the following... (1 Reply)
Discussion started by: nkwilliams
1 Replies
6. Shell Programming and Scripting
Hi all,
I am new to Linux/shell scripting having moderate knowledge.
In my script, I need to get execution time of a command (say 'ls') in mili seconds level. For this i tried using "time" command to retrieve the total execution time in milli seconds. But, the problem is that, how to save... (9 Replies)
Discussion started by: happening_linux
9 Replies
7. Shell Programming and Scripting
My script below seems to be choking because I need the the output of the find command to be stored as a variable that can then be called by used lower in the script.
#!/bin/bash
cd "/resumes_to_be_completed"
var1=find . -mmin -1 -type f \( -name "*.doc" -o -name "*.docx" \)... (1 Reply)
Discussion started by: binary-ninja
1 Replies
8. Shell Programming and Scripting
Hi,
My aim is to get the md5 hash of a file and store it in a variable.
var1="md5sum file1"
$var1
The above outputs fine but also contains the filename, so somthing like this 243ASsf25 file1
i just need to get the first part and put it into a variable.
var1="md5sum file1"... (5 Replies)
Discussion started by: JustALol
5 Replies
9. UNIX for Advanced & Expert Users
I have a below syntax its working fine...
var12=$(ps -ef | grep apache | awk '{print $2,$4}')
Im getting expected output as below:
printf "%b\n" "${VAR12}"
dell 123
dell 456
dell 457
Now I wrote a while loop.. the output of VAR12 should be passed as input parameters to while loop and results... (5 Replies)
Discussion started by: sam@sam
5 Replies
10. Shell Programming and Scripting
Hi All,
I want to run multiple sql queries and store the data in variable but i want to use sql command only once. Is there a way without running sql command twice and storing.Please advise.
Eg :
Select 'Query 1 output' from dual;
Select 'Query 2 output' from dual;
I want to... (3 Replies)
Discussion started by: Rokkesh
3 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)