PERL: how to tell if variable is NULL Post: 34878

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1. Shell Programming and Scripting

How to filter a null variable.

I have the necessity to use this command: cat file1 | grep $A | grep $B where sometime A and, or, B are not set. For example: I set A=@ never defined or set B The above command send a cat error. Any idea? Thanks. Giovanni

2. Shell Programming and Scripting

check for NULL variable

Hello I want to check for NULL variable.. but this is not working..please help thanks in advance esham

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test Null variable

hi forum i beginning with script and i want test un null variable in a schell i just don t know the syntax here is a litle example y=test echo $y unset y echo $y (so here Y = Null) if Y=Null then echo "y is null" exit fi

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not null cheking of an argument in perl

Hi, I have to check whether an argument say $ARGV is not null in an if operator. Please let me know the operator. It would be great if you write a psuedo code. Thanks in advance Ammu

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how to check null variable

korn shell If then update_smartcare_user_password "$u_id" else echo "Not a database user" fi i get this error Syntax error at line *** : `then' is not expected. what should i do. I want to check whether $a is null or not.

6. Shell Programming and Scripting

Question on NULL and zero value of variable

Hi all, I have a stupid question on NULL and zero(0). In a script I've been working with, one of the lines is: if && then The problem I seem to have is when $Current_csm2 is null, this if block is not triggered, and I don't get why because I was under the impression that NULL!=0 Can...

7. Shell Programming and Scripting

Value of variable is NULL, but test doesn't seem to recognize

Hello, Unix-forums! My problem: read -p "Enter any number, please" number sleep 1 echo $number | tr -d 0-9 test -z $number && echo "Thank you" || echo "This is not a number"Test always displays "This is not a number". It doesn't matter if I entered a or 1. But if I order echo...

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Checking for null condition in a UNIX variable

i have this code for i in `cat sql_output.txt` do -- some script commands done sql_output.txt has 1 column with employee_ids If the sql_output.txt is null then the do loop should not execute. How can i implement this. for i in `cat sql_output.txt` If i is null or empty then ...

9. Shell Programming and Scripting

If condition to check null variable

Guys, Please help me on the below sample.cfg var=NULL sample.sh #!/bin/sh . /sample.cfg if ;then 1 st command here else 2 nd command here fi

10. Shell Programming and Scripting

If grep value is null then assign 0 to variable

LEARN ABOUT PHP

apache_setenv

APACHE_SETENV(3)							 1							  APACHE_SETENV(3)

apache_setenv - Set an Apache subprocess_env variable

SYNOPSIS

       bool apache_setenv (string  $variable, string  $value, [bool  $walk_to_top = false])

DESCRIPTION

       apache_setenv(3) sets the value of the Apache environment variable specified by $variable.

       Note

	       When setting an Apache environment variable, the corresponding $_SERVER variable is not changed.

PARAMETERS

	      o $variable
		- The environment variable that's being set.

	      o $value
		- The new $variable value.

	      o $walk_to_top
		- Whether to set the top-level variable available to all Apache layers.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Setting an Apache environment variable using apache_setenv(3)

	      <?php
	      apache_setenv("EXAMPLE_VAR", "Example Value");
	      ?>

NOTES

       Note

	      apache_setenv(3)	can  be  paired  up  with  apache_getenv(3)  across separate pages or for setting variables to pass to Server Side
	      Includes (.shtml) that have been included in PHP scripts.

SEE ALSO

       apache_getenv(3).

PHP Documentation Group 													  APACHE_SETENV(3)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to filter a null variable.

Discussion started by: gio123bg

2. Shell Programming and Scripting

check for NULL variable

Discussion started by: esham

3. Shell Programming and Scripting

test Null variable

Discussion started by: kykyboss

4. Shell Programming and Scripting

not null cheking of an argument in perl

Discussion started by: ammu