passwd in bash, because
p. See here for more info on this feature.
ASCII table here or in
man ascii, you need the hex value for the character, for
p it is
70 so you produce it with
Or if you already installed
zsh and have turned on the interactive menu completion then from a
zsh shell you can
cd /usr/bin/. And then type
./ and press TAB and keep it pressing/pressed until the interactive menu completion kicks in and then just select
passwd with the cursor keys.
Or if you have
mc (Midnight Commander) installed you can use that to select
/usr/bin/passwd and then press ENTER on it to launch it or ALT+ENTER to copy the selected filename to the command line. (In this case you will likely need the latter as you will have to supply the username also to the command line because you are not changing the root's password but some user's. So simply launching
passwd is not want you want.)
Or any similar interactive selection program should work, but obviously these should be already installed on your system as now you don't have access to the admin password so you can't install anything.
Or if you have only
/usr/bin/ which has only one letter before
asswd (on a default setup this is true) then of course you can just use
bash's globbing features and simply type: