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/usr/share/horde/passwd/scripts/passwd-expect-kerberos is in php-horde-passwd 5.0.2-3+deb8u1.

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#
# The following expect script enables the password change over kerberos
# kpasswd.
#
#  Dilyan Palauzov <didopalauzov@aegee.org>, 2005
#
gets stdin user
gets stdin oldpw
gets stdin newpw
set log [lindex $argv 1]
set err [open $log "w" "0600"]
set pid [spawn /usr/bin/kpasswd $user]
set timeout 1
expect {
    "Password for *: "
    {
        send $oldpw\r
    }
    eof {
        puts $err $expect_out(buffer)
        close $err
        exit 1
    }
}

expect {
    "Enter new password: "
    {
        send $newpw\r
    }
    eof {
        puts $err $expect_out(buffer)
        close $err
        exit 1
    }
}
expect {
    eof {exit 1}
    "Enter it again: "
    {
        send $newpw\r
    }
}
expect {
    eof {
        puts $err $expect_out(buffer)
        close $err
        exit 1
    }
    "Password changed."
    {
        close $err
        exit 0
    }
}

close $err
exit 0