[SOLVED] Problem in assigning value to a variable in shell script.

mshforever · 11-22-2010, 10:01 AM

Hi,

Why doesn't "var1=`echo $var2 | grep pattern`" work ?
Please help me.

i92guboj · 11-22-2010, 10:19 AM

It should. What does the command in between tickers (`) return? What ***exact*** line are you using in your script? I need to see it exactly as-is, to the last quote and punctuation character, please, copy/paste directly. Also, explain ***how*** it doesn't work. Is there an error? Is it just empty? How are you retrieving or using $var1? What's the contents of $var2?

catkin · 11-22-2010, 10:21 AM

It does normally work. Can you copy and paste testing it at the command prompt, including an echo "'$var2'" before the problem variable assignment so we can see exactly what you are doing?

mshforever · 11-24-2010, 12:09 PM

Quote:

Originally Posted by i92guboj

It should. What does the command in between tickers (`) return? What ***exact*** line are you using in your script? I need to see it exactly as-is, to the last quote and punctuation character, please, copy/paste directly. Also, explain ***how*** it doesn't work. Is there an error? Is it just empty? How are you retrieving or using $var1? What's the contents of $var2?

Thnks for the reply and sorry for the delay. The exact code is:

procinfo=`awk -F\\\t '/model name/{print $2}' /proc/cpuinfo`
varDual=`echo $procinfo | grep Duo`

mshforever · 11-24-2010, 12:10 PM

Quote:

Originally Posted by catkin

It does normally work. Can you copy and paste testing it at the command prompt, including an echo "'$var2'" before the problem variable assignment so we can see exactly what you are doing?

Thnks for the reply and sorry for the delay. The exact code is:

procinfo=`awk -F\\\t '/model name/{print $2}' /proc/cpuinfo`
varDual=`echo $procinfo | grep Duo`

catkin · 11-24-2010, 01:53 PM

What is the output of awk -F\\\t '/model name/{print $2}' /proc/cpuinfo on your system?

mshforever · 11-29-2010, 04:50 AM

Quote:

Originally Posted by catkin

What is the output of awk -F\\\t '/model name/{print $2}' /proc/cpuinfo on your system?

Thanks for the replies. I get ": Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz".

grail · 11-29-2010, 05:38 AM

So then what do you get after running:

Code:

echo "$varDual"

My guess is it should be the same as:

Quote:

: Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz

mshforever · 11-30-2010, 07:05 AM

Quote:

Originally Posted by grail

So then what do you get after running:

Code:

echo "$varDual"

My guess is it should be the same as:

Looks like the issue earlier I was getting is not appearing now. Thanks for all the replies it really helped.