Check if a variable is having value Post: 302769390

Sponsored Content

Top Forums Shell Programming and Scripting Check if a variable is having value Post 302769390 by anil510 on Tuesday 12th of February 2013 05:42:49 AM

02-12-2013

Registered User

Check if a variable is having value

I have a script /root/asas with following contents.

Code:

#!/bin/bash

ha=`cat /etc/passwd | grep sandra`

if [ -n $ha ]; then
        echo "Sandra is in /etc/passwd"
        echo "variable ha is $ha"
else
        echo "Sandra is NOT in /etc/passwd"
        echo "variable ha is $ha"

fi

What I need is when "cat" does not find sandra in /etc/passwd, it should print "Sandra is NOT in /etc/passwd". But this is not giving correct result. See below.

Code:

[root@server ]# grep sandra /etc/passwd
#sandra

[root@server ]# sh /root/asas
Sandra is in /etc/passwd
variable ha is #sandra

[root@server ]# grep sandra /etc/passwd  --> sandra removed from /etc/passwd

[root@server ]# sh /root/asas
Sandra is in /etc/passwd  --> supposed to be "Sandra is NOT in /etc/passwd"
variable ha is

anil510

View Public Profile for anil510

Find all posts by anil510

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Check if variable is a number

If I have a variable $X, how do I check it is a number? Many thanks.

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

3. Shell Programming and Scripting

How to check parameter variable?

Hello All, I have a script that will email out if the email address is specified as parameter 1. I am using ksh, and then tried the following : email=$1 Following did not work, I am getting error test -z $email test ${email:=" ") -eq " " test -n $email test ${?email} What...

4. Shell Programming and Scripting

How to check if a variable contains a .

Hi I am writing a bash script and would like to check is a variable contains a . or not ex. a=102 output ok a=1.02 output not ok Many thanks,

5. Shell Programming and Scripting

check if a variable is not affected

Hi all, to check that a variable is not empty, I usually do: if ; then... or if ; then... what if I have a serie of variables and want to do the same test on all of them. How to do this in a single if statement? thank you

6. UNIX for Dummies Questions & Answers

Check the value of a string variable

hi to all, i want to check the value of a variable that it contains characters. for example i try the following: if then ......... i just want to check that in the specific line that is a variable called "passline" has the entry "password". But it can contain also other characters in the...

7. Shell Programming and Scripting

Check if a variable is zero

I have seen many posts for this sort of problem but I just did not know how to use it for my issue. A number is assigned to a variable and I wanted to check if it is a zero or non zero. Example of my numbers are below: 000000000000000000000000000000000000000000000000...

8. Shell Programming and Scripting

Check the value of a variable

#!/bin/sh echo "Running Script to capture ORACLE Erros" # Change Directory to the actual logs path cd /home/nv8510/lognew err_var=`grep -in "ORA-" *` if then echo "THESE ARE THE ORACLE ERROR OCCURED" echo "$err_var" echo...

9. Shell Programming and Scripting

How to check whether a variable is empty or contains some value?

hi, i want to check whether a a variable contains some value or is empty in a shell script. so if the variable contains some value i want to do some job and if the variable doesnt contain any value then i need to skip that job. here is a sample script read_filenames.sh contains ...

10. Shell Programming and Scripting

Check variable

Hi people, I would like to start a review of my config variable to check whether they have been changed and if not then there is only an echo. If they have been changed to my other commands are executed. I hope you can help me. with best regards JPad edit: here my code if ;...

LEARN ABOUT OPENDARWIN

slapd-passwd

SLAPD-PASSWD(5) 						File Formats Manual						   SLAPD-PASSWD(5)

NAME

       slapd-passwd - /etc/passwd backend to slapd

SYNOPSIS

       /etc/openldap/slapd.conf

DESCRIPTION

       The  PASSWD  backend  to slapd(8) serves up the user account information listed in the system passwd(5) file.  This backend is provided for
       demonstration purposes only.  The DN of each entry is "uid=<username>,<suffix>".  Note that non-base searches scan the  the  entire  passwd
       file, and are best suited for hosts with small passwd files.

CONFIGURATION

       This slapd.conf option applies to the PASSWD backend database.  That is, it must follow a "database passwd" line and come before any subse-
       quent "backend" or "database" lines.  Other database options are described in the slapd.conf(5) manual page.

       file <filename>
	      Specifies an alternate passwd file to use.  The default is /etc/passwd.

FILES

       /etc/openldap/slapd.conf
	      default slapd configuration file

       /etc/passwd
	      user account information

SEE ALSO

       slapd.conf(5), slapd(8), passwd(5).

OpenLDAP 2.1.X							    RELEASEDATE 						   SLAPD-PASSWD(5)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Check if variable is a number

Discussion started by: handak9

2. Shell Programming and Scripting

check for NULL variable

Discussion started by: esham

3. Shell Programming and Scripting

How to check parameter variable?

Discussion started by: negixx

4. Shell Programming and Scripting

How to check if a variable contains a .

Discussion started by: gekkos