Problem in expr 2+4

[sanjay goyan]

Dear friends ,

file is test.sh

echo expr 2+4;

its give result 2+4 not 6 so plz tell how can i get the right result

sanjay

[Duoas]

What shell are you using. If it is bash or csh or somesuch, you need to use backquotes: echo `expr 2+4` Hope this helps.

[sanjay goyan]

Dear ,

I am using Bash shell and i did echo `expr 2+4`

but it give 2+4 not 6 ..

plz help me sir why its not working ???????????

sanjay

[sanjay goyan]

Dear friends ,

i solved this problem by following ..........

echo `expr 2 + 4`

its give result 6 .we should give space between operator and operand

sanjay

[stilllearning]

With bash if you are typing on the command line you can just type

$ expr 2 + 4
6

If you are putting it in a file, you can do

#! /bin/bash

expr 2 + 4
var=`expr 2 + 4`
echo $var

and it will print:
6
6

[eggi]

If you're using a more advanced shell than posix or sh, you can use "let" also - just a suggestion :)

let var=2+4
echo $var

let works the opposite of expr, in so far as the spaces go - you shouldn't put any spaces between operators and operand

, Mike

[masijade]

You can also, as long as it is not csh or sh, just simply do
var=$(( 2 + 4 ));
var=$(( $var + 2 ));