Linux script, add two numbers

[dmitriylm]

Can anyone write a simple linux script (than can be run in the terminal) that will take the input of two numbers (maximum two digits), echo back to the screen and then add them up and echo the total? I want to see how this would look so I can start playing with some scripting.

[notfred]

Code: Select all

> cat plus.sh
#!/bin/sh
echo $1 + $2 = `expr $1 + $2`
>


Code: Select all

> ./plus.sh 3 4
3 + 4 = 7
>

[dmitriylm]

Code: Select all

> cat plus.sh
#!/bin/sh
echo $1 + $2 = `expr $1 + $2`
>


Code: Select all

> ./plus.sh 3 4
3 + 4 = 7
>

I'm logging onto a unix server at San Francisco State University using SSH to do a lot of my practice and plus.sh is not a valid command.

[radix]

It's like you need to create a file plus.sh with the content suggested? I am guessing you never used Linux before, hehe.

[dmitriylm]

It's like you need to create a file plus.sh with the content suggested? I am guessing you never used Linux before, hehe.

Well I did use vi to create a file named plus.sh with that contents and I'm still getting no result. I'm definitely a noobie with the terminal as most of my time with Linux is spent in a GUI.

[bthylafh]

At the prompt type "chmod 700 plus.sh", then "./plus.sh".

[dmitriylm]

At the prompt type "chmod 700 plus.sh", then "./plus.sh".

I used chmod uog+rwx plus.sh which should be fine as well.

[bthylafh]

I used chmod uog+rwx plus.sh which should be fine as well.

chmod 777 plus.sh is the shorter way to write that, and 770 is better from a security standpoint.

[notfred]

Are you running it as "./plus.sh" or just "plus.sh"? Usually you don't have . in your path to avoid getting haxored.