CODEWITHSUNDEEP
linuxbash
kirthan shetty
kirthan shetty

Reputation: 491

Pass YES and NO sequentially to a bash script

I need to pass yes or no input to a bash script. It works for single single input using yes, however if the bash script has multiple input (more than one) how can I pass it ? Below is the example for a single yes input:

yes | ./script

I can't send as below if the script needs different input, for instance:

yes | no | ./script

Upvotes: 1

Views: 6654

Answers (4)

kirthan shetty
kirthan shetty

Reputation: 491

We can also use below command also

echo -e "yes\nno" | ./script.sh

Upvotes: 2

Paul Hodges
Paul Hodges

Reputation: 15273

You can just send the lines you want -

printf "yes\nno\n" | ./script.sh

or if you need a certain number of each -

{ yes yes |head -50; yes no | head -50; } | ./script.sh

Or if you need them toggled -

yes | awk '{ if (NR%2) {print "yes"} else {print "no"} }' | ./script.sh

(only using yes here as a driver for records to read, lol)

Upvotes: 0

F. Hauri - Give Up GitHub
F. Hauri - Give Up GitHub

Reputation: 70792

You can pass 1 yes, then 1 no, then again 1 yes and 1 no and so on by using:

yes $'yes\nno' | ./script.sh

Using bash, you could revert pipe by using this syntaxe:

./script < <(yes $'yes\nno')

Sample:

head -n 6 < <(yes $'yes\nno')
yes
no
yes
no
yes
no

... or two yes and one no:

head -n 6 < <(yes $'yes\nyes\nno')
yes
yes
no
yes
yes
no

Or any other combination...

Upvotes: 4

choroba
choroba

Reputation: 241858

yes sends y (or whatever else you tell it to send) to its standard output. If you want yes and no on the standard output, you can use echo:

{   echo yes
    echo no
} | ./script

I used a block to pipe both inputs to the script. There are more possible ways, e.g.

printf '%s\n' yes no | ./script.sh

Upvotes: 5

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