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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line

line(1) 						      General Commands Manual							   line(1)

NAME

       line - Reads one line from standard input

SYNOPSIS

       line

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       line:  XCU5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

OPTIONS

       None

DESCRIPTION

       The  line  command  copies one line, up to and including a newline, from standard input and writes it to standard output.  Use this command
       within a shell command file to read from your terminal.	The line command always writes at least a newline character.

NOTES

       The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead.

EXIT STATUS

       Success.  End-of-File.

EXAMPLES

       To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log

       This shell procedure displays the message: Enter comments for the log:

       It then reads a line of text from the keyboard and adds it to the end of the file log.  The echo  ':  c'  command  displays  a	:  (colon)
       prompt.	See the echo command for information about the c escape sequence.

SEE ALSO

       Commands:  echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p)

       Functions:  read(2)

       Standards:  standards(5)

																	   line(1)