Read in passwords with bash

25 March 2005   35 comments   Linux

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This has taken me some time to figure out because I couldn't find anything on Google. I think the problem was that I didn't know what to look for.

If you have a bash script that asks the user to enter their username and password you use the read function in sh. But when you read in the password you don't want it to show on the screen what you're writing. Someone could be leaning over your shoulder. Python has a similar standard library module called getpass which works like this:

>>> from getpass import getpass
>>> p = getpass("Password please: ")
Password please: 
>>> print "Your password is", len(p), "characters long"
Your password is 5 characters long

That's fine if you do this via Python; but I needed to do it in one of my bash scripts. Here's how to do it:

#!/bin/bash
read -p "Username: " uname
stty -echo
read -p "Password: " passw; echo
stty echo

Now, hopefully this will help other people who get stuck with the same problem.

Comments

Roger Telco
Thanks, this is very useful! Needed this exact functionality for a script I was writing.
Ewynn
Nice, needed the python way of doing this.
Dion
thanks
John B. Cole
Thanks! I needed a quick way to do this in bash and your code works like a charm.
uli
helpful indeed
Anonymous
Very helpfull, needed the bash example
Works gr8! Thnx!
Diego
realy usefull. thanks
Bud
Nice, first hit on google for "bash read password" and exactly what i need :D
michael
Easier solution:
read -s -p "Password: " passwd
see also: the description for builtin commands in the bash man page (man bash or info bash)

also interesting is read -e ... to gain readline support for editing the input line
pierz
thx !
robby
thanks for the tips!
nick
Perfect. I struggled for an hour before I found your method.
fritteli
awesome, just what i was looking for! and reading michael's comment from oct 26th showed me an even more elegant solution. thanks a lot!
martin
THANKS!!!!
Exactly what im looking for.
Greetz from germany,
Martin
AnilG
This page shows first hit in Google when searching:
reading password python
Anonymous
First page for "python read password" too. Thanks!
Anonymous
Thanks!
humpy101
Brilliant! Thanks very much
Joshua Randall
Note that you actually don't need to handle the terminal options with stty yourself -- the bash read builtin has an option that will do it for you [-s]. See http://www.ss64.com/bash/read.html for the other options for the read builtin.

The following example should be functionally equivalent to yours:

#!/bin/bash
read -p "Username: " uname
read -s -p "Password: " passw
Peter Bengtsson
Definitely a cleaner solution. Had I only known!
Richard Bronosky
Before doing a "stty -echo" or a "read -s", you should set trapping like so:
trap "stty echo; exit" INT TERM EXIT

Otherwise the script can exit in a state where the user can't see there keystrokes and then they get confused.
Token Paki
@Joshua Randall, @Richard Bronosky Thanks a mill. Exactly what I was looking for.
Lanai
Excuse me. Winning is important to me, but what brings me real joy is the experience of being fully engaged in whatever I'm doing.
I am from Arabia and also now am reading in English, give please true I wrote the following sentence: "This court was based generally that breeches could smuggle again of the speaker, whom they said based as an character or song of the settlement."

Thank you very much :-(. Lanai.
Matt
I constantly am getting this error:

read -s -p "Password: " passw
read: 4: illegal option -s

does anyone know why I can't get -s to work?
Anonymous
Hi Matt!

In a script, start with

#!/bin/bash

instead of

#!/bin/sh
K. Howe
Nice! Thanks.
Jess
Just what I was looking for.

Thanks so much.
Mike
Just perfect. Thank you so much!
Anonymous
thanks buddy........
Cyrus
You may also use this command :
read -s -p "Password: " mypassword

src : http://bash.cyberciti.biz/misc-shell/shel-to-accept-password/
Boris Kheyfets
Thank You! I was looking for a bash version.
Anonymous
Thanks !
Coder of Salvation
hi..I just wrote this in my .bashrc to improve security.

alias gcal='stty -echo; read -p "password: " password && stty echo && gcalcli --user foo@gmail.com --pw $password'
RayJ
Beautiful
Simple & works
David Castillo
how about if the password has special characters?
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