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How can I write Bash Code for Hiding Password Or convert into '*' user input will be in string so no spaces, and change or hide password String.

marked as duplicate by muru, Jeff Schaller, RalfFriedl, roaima, Stephen Harris Dec 12 '18 at 1:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • 1
    A string is a string even if it contains spaces, and passwords often contain spaces... – Kusalananda Dec 10 '18 at 20:33
  • Oooph, tough call for me on VTC here. The target Q does have an answer that would print asterisks, as asked (in a comment) in this question, but it doesn't handle backspaces as also hinted at here. I'll VTC because it's a good duplicate otherwise, but if this question is edited to incorporate new requirements, it could become separate. – Jeff Schaller Dec 11 '18 at 13:54
12

Use read -s to not echo the input, i.e. show nothing when the user types the password:

read -p 'Password? ' -s password
echo Your password is "$password".
  • instead of hiding can i convert to character * – AlphaCoder Dec 10 '18 at 17:00
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    Not so easily. You can read -n1 and display the asterisk yourself, though. – choroba Dec 10 '18 at 17:04
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    @choroba: I've just tested a bit, and -- it looks like using read -n1 for this has some sharply negative consequences, e.g. in that it's a lot of work to try to support backspace. – ruakh Dec 11 '18 at 0:20
  • @AlphaCoder It is not idiomatic in Unix to display even the length of a password at the CLI. – chrylis Dec 11 '18 at 8:00
  • @ruakh: Yes, that's part of the "not so easily". – choroba Dec 11 '18 at 16:58
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You can use the systemd-ask-password, the password will displayed as asterisks while typing.

Format: (systemd-ask-password --help)

systemd-ask-password [OPTIONS...] MESSAGE

e,g:

PASSWORD=$(systemd-ask-password "Please type your Password:")
Please type your Password: ***********
  • 1
    When I try this, I get bash: systemd-ask-password: command not found . . . – ruakh Dec 11 '18 at 0:15

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