Is there a way to input automatically when running a script?

Question

I am trying to execute a script file which asks for password as input. Is there any way we give the command the input it needs automatically? It's in psql which has parameter -U for username but no parameter for password.

Example:

exa00009@exa00009:~$ sh redshift.sh
Password for user xyz:

Possible duplicate of [passing arguments to an interactive program non interactively](http://stackoverflow.com/questions/14392525/passing-arguments-to-an-interactive-program-non-interactively) — Xiong Chiamiov, Jul 19 '16 at 21:52

score 1 · Answer 1 · answered Jul 18 '16 at 08:15

You can use expect for this. Here is simple example:

#!/usr/bin/expect -f
set PASSWORD "1"
set USER "dvp"
spawn psql -U ${USER} -W
expect "*?assword*"
send -- "${PASSWORD}\r"
expect eof

Probably you need to install expect first:

sudo apt-get install expect

score 0 · Accepted Answer · edited May 23 '17 at 12:17

0

You can provide command line argument for your script like below: sh redshift.sh yourInput and in your script get it as var input=$1 and use accordingly.

This question is already answered here

edited May 23 '17 at 12:17

Community

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answered Jul 18 '16 at 06:36

Amol Bais

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can u elaborate , my .sh file has psql command which excepts username parameter but not password . i need to automate it so that i just have to run script – Vishal Jul 18 '16 at 06:46

Is there a way to input automatically when running a script?

2 Answers2