shell scripting – nixCraft

Shell script to General FreeBSD and Linux System information

in Monitoring last updated February 26, 2009

Shell script to display general FreeBSD and Linux System information such as, Hostname, OS version, Kernel version, Processor/CPU, Total RAM, System load, network interface, total logged in users, Hard disks, Runlevel etc in neat format.

How do I use the script?

You need to download following two files for FreeBSD operating systems:

File # 1 Save this file as /usr/local/etc/bashmonscripts
File # 2 : Save this file as /usr/local/etc/defaults.conf

For Linux system, you need to update /usr/local/etc/defaults.conf to point out exact binary path location. /usr/local/etc/bashmonscripts is nothing but functions library used by this script. bashmonscripts works under both Linux and FreeBSD.

#!/bin/bash
# Shell script to General FreeBSD and Linux System information such as:
# Hostname, OS version, Kernel version, Processor/CPU, Total RAM,
# System load, network interface, total logged in users, Hard disks,
# Runlevel etc. I will write separate scripts for detailed system 
# information :D
# Copyright (c) 2005 nixCraft project
# This script is licensed under GNU GPL version 2.0 or above
# For more info, please visit: 
#            http://cyberciti.biz/shell_scripting/bmsinstall.php
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
 
SPATH="/usr/local/etc/bashmonscripts"
INITBMS="$SPATH/defaults.conf" 
[ ! -f $INITBMS ] && exit 1 || . $INITBMS
 
echo "Hostname:" $(getHostName)
echo "OS Name:" $($UNAME)
echo "OS Version:" $($UNAME -mr)
echo "Processor:" $(getCpuInfo)
echo "Total Physical Memory (RAM):" $(getRealRamInfo)
echo "System Load:" $(getSystemLoad)
echo "Date & Time:" $($DATE)
echo "Network interface:" $(getNumberOfInterfaces)
echo "Total logged in users:" $(getNumberOfLoggedInUsers)
echo "Total running process:" $(getNumberOfRunningProcess)
echo "Total SCSI/IDE disks:" $(getDiskDrives)
echo "Mounted partitions:" $(getNumberOfParittions)
echo "Loaded dynamic kernel modules/drivers:" $(getNumberOfKernelModules)
echo "OS Rulevel:" $(getOsRunLevel)

Shell script to Finding Accounts with No Password ( null password account )

in Monitoring last updated April 10, 2008

A password is a form of secret authentication data that is used to control access to a resource. The password is kept secret from those not allowed access, and those wishing to gain access are tested on whether or not they know the password and are granted or denied access accordingly.

This script find out all accounts with null password.

#!/bin/bash
# Shell script to Finding Accounts with No Password
# Useful to improve system security
# Copyright (c) 2005 nixCraft project
# This script is licensed under GNU GPL version 2.0 or above
# For more info, please visit:
#            http://cyberciti.biz/shell_scripting/bmsinstall.php
# TODO
# - Disable all account w/o password
# - Send an email to admin 
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
 
SPATH="/usr/local/etc/bashmonscripts"
INITBMS="$SPATH/defaults.conf"
[ ! -f $INITBMS ] && exit 1 || . $INITBMS
 
if ( isRootUser ); then
	$GREP -v -E "^#" $SHADOW_FILE | $AWK -F: '$2 == "" { print $1 }'
else
	echo "Permission denied [$($ID -u)]"
fi

Shell script to Finding ALL Superuser ( root ) Accounts under UNIX / Linux OSes

in Monitoring last updated April 10, 2008

In Unix-style computer operating systems, root is the conventional name of the user who has all rights or permissions in all modes (single- or multi-user). The root user can do many things an ordinary user cannot, such as changing the ownership of files and binding to ports numbered below 1024.

It is never good practice for anyone to use root as their normal user account because simple typographical errors in entering commands can cause major damage to the system. It is recommended to create a normal user account instead and then use the su command to switch when necessary. Some use the sudo utility instead, which allows a measure of graduated access. Following script find out all root user account on system.

#!/bin/bash
# Shell script to Finding ALL Superuser Accounts
# Useful to improve system security.
# Copyright (c) 2005 nixCraft
# This script is licensed under GNU GPL version 2.0 or above
# For more info, please visit: 
#            http://cyberciti.biz/shell_scripting/bmsinstall.php
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
grep -v -E "^#" /etc/passwd | awk -F: '$3 == 0 { print $1}'

Shell script to find all programs and scripts with setuid bit set on

in Monitoring last updated April 10, 2008

#!/bin/bash
# Shell script to find all programs and scripts with setuid bit set on.
# If your system ever cracked (aka hacked) then system has this kind of binary 
# installed; besides the normal setuuid scripts/programs
#
# *TIP*
# User directory /home and webroots such as /www canbe mounted with
# nosuid option.
#
# Copyright (c) 2005 nixCraft project.
# This script is licensed under GNU GPL version 2.0 or above
# For more info, please visit: 
#            http://cyberciti.biz/shell_scripting/bmsinstall.php
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
#SPATH="/usr/local/etc/bashmonscripts"
#INITBMS="$SPATH/defaults.conf" 
#[ ! -f $INITBMS ] && exit 1 || . $INITBMS
 
[ $# -eq 1 ] && : || die "Usage: $($BASENAME $0) directory" 1
 
DIRNAME="$1"
$FIND $DIRNAME -xdev -type f -perm +u=s -print