public/subjects/devops/plus

plus

Instructions

In this exercise, you will make a script that will take two arguments from the command line, add them and output the result.

Usage

$ ./plus.sh 2 3 | cat -e
5$
$

Hints

Here are some commands that you can combine to find the solution:

• expr: this command evaluates an expression and outputs the result.

• command substitution - $(...): this command can be used to interpolate the output of running a command into a string. You can replace the ellipsis with your command.

You could use expr like this:

$ expr 2 - 2
0
$

And $(...) like this:

$ echo "This is the content of a file: $(cat file.txt)"
This is the content of a file: <content of the file>`
$

References

• expr.

• command substitution.