Print asterisk instead of password (Bash) Post: 302989766

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Top Forums Shell Programming and Scripting Print asterisk instead of password (Bash) Post 302989766 by rbatte1 on Wednesday 18th of January 2017 05:32:55 AM

01-18-2017

Moderator

I think that the -p flag of read takes the next item as a prompt, so you might have:-

Code:

$ cat pass.sh
echo "Enter the username"
read username

stty -echo
read -p "Enter password:- " password
stty echo
echo           # Force new-line because otherwise
               # the cursor is left at the end of the prompt and may confuse any subsequent output.

To display one * for every key press will be more tricky. You would need to read the input 1 character at a time and display the *, building up your overall password variable as you go. No doubt you would also want to handle mistakes in the input, so you would have to allow a backspace character and both delete an * from the screen (making sure that you don't start deleting the prompt) but also remove the last character from the variable you are building up.

Is it really worth this much effort? A telnet or ssh login prompt does not go to these lengths, and it's of limited value to the user anyway.

Those horrible project management phrases are clanging in my head - cost justification; business need; supportability; ..........

Robin

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LEARN ABOUT DEBIAN

bashbug

BASHBUG(1)							      bashbug								BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--help] [--version] [bug-report-email-addresses]

DESCRIPTION

       bashbug is a utility for reporting bugs in Bash to the maintainers.

       bashbug will start up your preferred editor with a preformatted bug report template for you to fill in. Save the file and quit the editor
       once you have completed the missing fields.  bashbug will notify you of any problems with the report and ask for confirmation before
       sending it. By default the bug report is mailed to both the GNU developers and the Debian Bash maintainers. The recipients can be changed
       by giving a comma separated list of bug-report-email-addresses.

       If you invoke bashbug by accident, just quit your editor. You will always be asked for confirmation before a bug report is sent.

OPTIONS

       --help
	      Show a brief usage message and exit.

       --version
	      Show the version of bashbug and exit.

       bug-report-email-addresses
	      Comma separated list of recipients' email addresses. By default the report is mailed to both the GNU developers and the Debian Bash
	      maintainers.

ENVIRONMENT

       DEFEDITOR
	      Editor to use for editing the bug report.

       EDITOR
	      Editor to use for editing the bug report (overridden by DEFEDITOR).

SEE ALSO

       bash(1), reportbug(1), update-alternatives(8) for preferred editor.

AUTHOR

       This manual page was written by Christer Andersson <klamm@comhem.se> for the Debian project (but may be used by others).

GNU Bash 3.1							 11 December 2007							BASHBUG(1)