UNIX for Dummies Questions & Answers

[CODE]#!/bin/sh

b= SERVER
if ["$a" == "$h"];
then
echo "hostname $a is same"
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This:

won't work for a number of reasons:

first, between "[" (which is actually the name of the command) and the rest needs to be a space, also between "]" and the preceeding character:

Code:

if [ "$a" == "$h" ];

Second, either you use ";" then you have to place the "then" on the same line or you want to put it in the next line, then skip the ";". The following two possibilities are both legal, i prefer the first, though:

Code:

if [ "$a" == "$h" ] ; then

if [ "$a" == "$h" ]
then

Third, "==" is not a legal operator. To test for string equality use "=", so your finally correct expression reads:

Code:

if [ "$a" = "$h" ] ; then

I hope this helps.

bakunin

This too is not working.

My basic intention is anyhow compare two alphanumeric value.
If that can work thn my half of the job will be done

What is not working and how is it not working? Are there any error messages, error codes, etc.? As a general rule you should post them, unedited. A "doesn't work" is hardly a help in finding out why.

Fortunately i spotted another syntax error in your script which i overlooked before:

Code:

h= hostname
a= dvlna002

Around the "=" operator to load values into variables spaces are not allowed. Correctly the declarations have to read:

Code:

h=hostname
a=dvlna002

Finally, a tip: always let a script run with "set -xv" as the first line if it doesn't do what you expect it to do. This way every line is printed (to stderr) before it is evaluated and you can watch the script run.

I hope this helps.

bakunin

As per your suggestion I have changed the script :


[CODE]#!/bin/sh
set -xv

___________________________
This is the detailed output which I getting:

[CODE]h=dvlna002

b=SERVER
+ b=SERVER
if ["$a" = "$h"]; then
echo "hostname $a is same"
else
echo "hostname $a is not same"
fi


Can you please help, still I am not getting my output.
I am really stucked with this issue.

Moderator's Comments:

edit by bakunin: please use CODE-tags. Thanks.

Have a look again what i told you in post #2. You will find the reason for these two errors there.

I hope this helps.

bakunin

Do you have any idea how to capture value