How to input a read value when calling a shell script

Question

Let say I have this line in a shell script in unix:

read -n 1

It will prompt the user to get value but is there a way to call the script so it takes the input as argument instead?

Like this for example:

myscript.sh "M"

I want to call the script from a build engine so it cannot answer with keyboard input.

Lohit Gupta · Accepted Answer · 2017-06-30 07:10:13Z

2

To use argument values in shell script you can pass the argument with the script and then refer them using $1, $2, $3 and so on.

answered Jun 30, 2017 at 7:10

Lohit Gupta

1,0816 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

anubhava · Accepted Answer · 2017-06-29 19:58:36Z

2

You can use Here Strings in bash:

myscript.sh <<< "M"

Or use pipeline:

echo "M" | myscript.sh

Here string documentation

edited Jun 29, 2017 at 19:58

answered Jun 29, 2017 at 19:54

anubhava

790k67 gold badges603 silver badges671 bronze badges

2 Comments

code-gijoe Over a year ago

I've been looking for ages for that, what are the keywords we can use?

anubhava Over a year ago

It shows up under Here Strings section in man bash. Or you can check link I have added in my answer.

Gilbert · Accepted Answer · 2017-06-29 19:58:31Z

0

Use this with some frequency:

hello() {  read -n1 CHAR;  echo $CHAR; }
echo world | hello

answered Jun 29, 2017 at 19:58

Gilbert

3,80619 silver badges21 bronze badges

Comments

user1934428 · Accepted Answer · 2017-06-30 06:29:38Z

0

How about

myscript.sh $(read -n 1)

?

answered Jun 30, 2017 at 6:29

user1934428

22.8k9 gold badges57 silver badges108 bronze badges

Collectives™ on Stack Overflow

How to input a read value when calling a shell script

4 Answers 4

Comments

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related