Run bash script from file with input

Question

I want to make a simple bash script that makes a for loop over a file with commands and execute those commands, and finishes when an error happens. I have something like this

#!/bin/bash
while IFS= read -r line; do
    echo $line
    output=$(eval $line)
    if [ $? -eq 0 ]
    then
        echo ok
    else
        echo $output
        break
    fi
    echo
done < summary.txt

The problem is that the first command I'm trying to make is a sudo command, so I have to put the password. I tried putting it in the command like

sudo -S <<< password <<< Y command

with no luck. I've checked that works if I just put it directly without having to read it (not putting it as a string). The thing is that without the loop, the program would be long with no much sense.

Thanks

Digvijay S · Accepted Answer · 2020-03-18 02:51:29Z

1

echo <password> | sudo -S < your command>

From man sudo

   -S, --stdin
                 Write the prompt to the standard error and read the password from the standard input instead of using the terminal
                 device.  The password must be followed by a newline character.

answered Mar 18, 2020 at 2:51

Digvijay S

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5 Comments

Silkking Over a year ago

There is one step missing. After the sudo I need to reply Y. In this case, when it's asked, it answers "abort"

Digvijay S Over a year ago

Do you mean after running sudo command you want to get input from stdin ?

Silkking Over a year ago

Yes. I need to install something (testing purposes) so I'm doing a sudo apt install. Normally it asks for password and to confirm Y/n, so I need to answer Y

user1934428 Over a year ago

How then about echo "<passwd>\nY" | sudo -S ..., or if you run into timing issues, (echo <passwd>; sleep 1; echo Y)|sudo -S ...?

Silkking Over a year ago

(echo <passwd>; sleep 1; echo Y)|sudo -S .. solved my problem! Thanks!

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