Sponsored Content
Top Forums Shell Programming and Scripting not null cheking of an argument in perl Post 302120259 by matrixmadhan on Tuesday 5th of June 2007 09:58:34 AM
Old 06-05-2007
Quote:
Originally Posted by ammu
Hi Vino,

Thanks for replying. I just want to know whether -z will work in perl script.

if it works then the code should be something like

if ( -z "$ARGV[2]" ) then.....fi


Please correct me if I am wrong

Thanks
Ammu

for not null checking in perl,

how about using
Code:
if ( ! defined $var  ) {
  print "not defined\n";
}
else {
  print "defined\n";
}

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

PERL: how to tell if variable is NULL

How to I do a check on a variable to see if it's null-- I am using Perl. (4 Replies)
Discussion started by: dangral
4 Replies

2. Shell Programming and Scripting

idea for script - cheking passwords

Hi All, I am looking for scripts where i need check normal user password and root password for more 100 servers from single server...! let me explin it what exacltly i need...! i need to do password audit for more than 600 boxes... :o for one normal user and root password also...... (5 Replies)
Discussion started by: bullz26
5 Replies

3. Shell Programming and Scripting

Perl Parsing Argument

i wanna passing an argument which read in a file or a set of files if the files are given in the command line, otherwise use STDIN if no file argument. i got something like that, but it is not really working. so can anyone help me? which one is better to use for and how? Use perl. Thank you ... (0 Replies)
Discussion started by: mingming88
0 Replies

4. Shell Programming and Scripting

PERL need help splitting argument

If i have a script name.pl I run it like name.pl -v file.txt -t ext2 -u user -j how can I edit the array @ARGV so when my script calls $ARGV = -v file.txt $ARGV = -j (2 Replies)
Discussion started by: 3junior
2 Replies

5. Shell Programming and Scripting

How to use perl to run bash with argument?

Hi All, I want to run a bash script using perl. But they are in the different dir. #! /usr/bin/perl -w use strict; my $root=`pwd`; chomp($root); my $cmd=".$root/testdir/ft_623.sh 3 4 5 6 7"; print $cmd; my @line=`$cmd`; foreach (@line){ print $_; } ft_623.sh (0 Replies)
Discussion started by: Damon sine
0 Replies

6. Shell Programming and Scripting

Redirect system output to null in perl

Hi Guys, Please help me.. it is urgent. I am writing a perl script to capture command output and redirect it to a logfile.At the same i want to check the return code of the command and log it if the command is not succesful in my logfile.. Here is my code, it is working but system command inside... (2 Replies)
Discussion started by: sriramperumalla
2 Replies

7. Shell Programming and Scripting

parsing argument in perl

in bash: LIST=`cat $1` for i in $LIST do ... done how will i do this in perl ? $1 is my first arguement. I'm a newbie in perl and will appreciate much your help guys ... (4 Replies)
Discussion started by: linuxgeek
4 Replies

8. Shell Programming and Scripting

command line argument - perl

how do i check if a command line argument is -g? for example, if command line argument equals "-g" { print "Goodbye \n"; } else { print "Welcome to the program! \n"; } (1 Reply)
Discussion started by: bshell_1214
1 Replies

9. Shell Programming and Scripting

bash script argument not outputing line -NULL

Hi everybody! I am writing a script which accepts two arguments one of them being a message. All is working except for the message part. That is, to accept text as an argument. I have trouble storing and echoing a line of text. It seems that writing a few words and store them in an... (6 Replies)
Discussion started by: bluetxxth
6 Replies

10. Shell Programming and Scripting

Passing multiple value in a single argument in Perl.

Hi all, I have below code through which trying to pick data from specific columns strating from a certain row. #!/usr/bin/perl #This script is to pick the specific fields from a files starting from a specific row # FILE -> Name of the file to be pasd at runtime. # rn -> Number of the... (4 Replies)
Discussion started by: Abhisrajput
4 Replies
ALTER 
OPERATOR(7) SQL Commands ALTER OPERATOR(7) NAME
ALTER OPERATOR - change the definition of an operator SYNOPSIS
ALTER OPERATOR name ( { lefttype | NONE } , { righttype | NONE } ) OWNER TO newowner DESCRIPTION
ALTER OPERATOR changes the definition of an operator. The only currently available functionality is to change the owner of the operator. You must own the operator to use ALTER OPERATOR. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the operator's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the operator. However, a superuser can alter ownership of any operator anyway.) PARAMETERS
name The name (optionally schema-qualified) of an existing operator. lefttype The data type of the operator's left operand; write NONE if the operator has no left operand. righttype The data type of the operator's right operand; write NONE if the operator has no right operand. newowner The new owner of the operator. EXAMPLES
Change the owner of a custom operator a @@ b for type text: ALTER OPERATOR @@ (text, text) OWNER TO joe; COMPATIBILITY
There is no ALTER OPERATOR statement in the SQL standard. SEE ALSO
CREATE OPERATOR [create_operator(7)], DROP OPERATOR [drop_operator(7)] SQL - Language Statements 2010-05-14 ALTER OPERATOR(7)
All times are GMT -4. The time now is 04:04 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy