Untuk mengetahui jenis shell yang sedang kita gunakan ketik :
# echo $SHELL
/bin/csh

atau dgn perintah berikut :

office-mlg# ps -p $$
PID TT STAT TIME COMMAND
59155 p0 S 0:00.04 /bin/csh

Untuk melihat shell apa saja yang tersedia di FreeBSDBox-mu ketik :
# more /etc/shells
/bin/sh
/bin/csh
/bin/tcsh
/usr/local/bin/bash

Ada satu tips lagih.. coba aja :

chmod 0750 `which curl` 2 > & - ; chmod 0750 `which fetch` 2 > & - ; chmod 0750 `which wget` 2 > & -

#!/bin/bash
USERS="$(awk -F: 'NF > 1 && $1 !~ /^[#+-]/ && $2=="" {print $0}'
/etc/passwd2 | cut -d: -f1)"
for u in $USERS
do
pw lock $u
done

Where
NF : Total number of record (so only continue if we have more than one record in password file)
$1 : First field in /etc/master.passwd
$2 : Second filed in /etc/master.passwd
$1 !~ /^[#+-]/ : It compares first field (user login name) and make sure it does not starts with either +,- or # symbol

How does it work?
1) Awk statement read each line in /etc/master.passwd where fields separated by : symbol
2) Account has no password if password field ($2) in /etc/master.passwd is empty

Once you found all such passwordless account., you can Lock user account with the following command:
pw lock {username}

# pw lock s2099msFor unlocking the account use:
pw unlock {username}

# pw unlock s2099ms