CODEWITHSUNDEEP
shellunix
user3112560
user3112560

Reputation: 11

execute shell script program

echo Enter 2 values: 
read val1 val2
c = `expr $val1 + $val2`
echo $c

While executing the shell script, I am getting the following problem:

addition.sh: 3: addition.sh: c: not found

Please help!!

Upvotes: 1

Views: 108

Answers (1)

fedorqui
fedorqui

Reputation: 290235

This is because you put whitespace between the variable 'c' and the '='. Hence, the shell assumes c is a command and =, and expr $val1 + $val2 are parameters given:

So instead of

c = `expr $val1 + $val2`
 ^ ^

write

c=$(expr $val1 + $val2)

All together:

echo Enter 2 values: 
read val1 val2
c=$(expr $val1 + $val2)
echo $c

Note that you can also get the result of the sum with:

echo $(( val1 + val2 ))

As a general rule, use var=$(command) to save a command output in a variable.

Upvotes: 4

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