Sponsored Content
Top Forums Shell Programming and Scripting Question on NULL and zero value of variable Post 302559749 by itkamaraj on Wednesday 28th of September 2011 04:43:50 AM
Old 09-28-2011
Code:
 
test -z $Current_csm2

 

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. UNIX for Dummies Questions & Answers

/dev/null 2>&1 question

Hi, suppose you have the following line at your crontab : 5 * * * * /usr/mine/script > /dev/null 2>&1 now i understood that the " > /dev/null 2>&1 outputs both Standard outpout and Standard Error messages to the /dev/null device or file... the first part , " > /dev/null " transfers... (1 Reply)
Discussion started by: BAM
1 Replies

3. 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 (1 Reply)
Discussion started by: gio123bg
1 Replies

4. 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 (2 Replies)
Discussion started by: esham
2 Replies

5. Shell Programming and Scripting

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 (1 Reply)
Discussion started by: kykyboss
1 Replies

6. Shell Programming and Scripting

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. (2 Replies)
Discussion started by: sachin.gangadha
2 Replies

7. Shell Programming and Scripting

Newbie question: if[command not null]

hi, i have to put in my script a command that should tell me if the contents of two different paths are the same. I thought to write an "if" command who makes the diff of two files which contains the `ls` of the folders and go on with the script if is not null, but i'm afraid of the fact... (13 Replies)
Discussion started by: zangarules
13 Replies

8. 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... (2 Replies)
Discussion started by: intelinside
2 Replies

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 (3 Replies)
Discussion started by: AraR87
3 Replies

10. Shell Programming and Scripting

If grep value is null then assign 0 to variable

DELETE=`cat $logfile1 | egrep -i "Delete" | sed 's/ */ /g' | cut -d" " -f2` INSERT=`cat $logfile1 | egrep -i "Insert" | sed 's/ */ /g' | cut -d" " -f2` UPDATE=`cat $logfile1 | egrep -i "Update" | sed 's/ */ /g' | cut -d" " -f2` I need soming like below: if value is null... (8 Replies)
Discussion started by: Veera_V
8 Replies
ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
All times are GMT -4. The time now is 01:08 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy