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Get Password (securely)

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  1. #!/bin/sh
  2.  
  3. # Demonstrate reading passwords in a shell script
  4. # while not echoing those passwords to the screen.
  5.  
  6. # Note `read -s` in bash 3 at least does not echo
  7. # the return/newline either? Therefore we need to
  8. # `echo >&2` after each read to simulate that.
  9.  
  10. getpassword()
  11. {
  12.     until [ "$password" = "$rpassword" -a -n "$password" ]; do
  13.         read -s -p "Enter a password for user '$1' : " password; echo >&2
  14.         read -s -p "Reenter password for user '$1' : " rpassword; echo >&2
  15.     done
  16.     echo "$password"
  17. }
  18.  
  19. pw=`getpassword "${1:-blah}"`
  20.  
  21. echo "password is '$pw'"

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