awk command – nixCraft

A shell script to check domain serial numbers across all name servers

in Domain last updated March 7, 2009

A shell script to check domain serial numbers across all name servers

Shell Script To Update Spamhaus Lasso Spam Database for PF Firewall

in Firewall last updated January 23, 2009

A Shell Script To Update Spamhaus Lasso Spam Database for PF Firewall.

Shell Script List All Top IP Address Accessing Apache / Lighttpd Web Server

in Web Server last updated December 30, 2008

A Shell Script To List All Top Hitting IP Address to your Apache / Nginix / Lighttpd Webserver. This may be useful to catch spammers and content scrappers bots.

MySQL Drop All Tables Shell Script Utility

in MySQL last updated November 13, 2008

A UNIX / Linux shell script utilty to delete / drop all tables from MySQL database.

NAS Backup Server Disk Monitoring Shell Script

in Backup, Diskadmin, Monitoring last updated September 13, 2008

A SHELL script to monitor NAS backup server and send an email when running out of backup disk space.

Script to update user password in batch mode using pwgen and chpasswd

in Security last updated October 23, 2008

#!/bin/bash
# Script to update user password in batch mode
# You must be a root user to use this script
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project 
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# ----------------------------------------------------------------------
# /root is good place to store clear text password
FILE="/root/batch.passwd"

# get all non-root user account
# By default on most linux non-root uid starts
# from 1000
USERS=$(awk -F: '{ if ( $3 > 1000 ) print $1}' /etc/passwd)

# create file with random password
echo "Generating file, please wait..."

# overwrite file, this is bash specific a better solution is cat > $FILE
>$FILE

for u in $USERS
do
   p=$(pwgen -1 -n 8) # create random password
   echo "$u:$p" >> $FILE # save USERNAME:PASSWORD pair
done
echo ""
echo "Random password and username list stored in $FILE file"
echo "Review $FILE file, once satisfied execute command: "
echo "chpasswd &lt; $FILE"

# Uncomment following line if you want immediately update all users password,
# be careful with this option, it is recommended that you review $FILE first
# chpasswd < $FILE

#!/bin/bash

# Script to update user password in batch mode

# You must be a root user to use this script

# -------------------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# ----------------------------------------------------------------------

# /root is good place to store clear text password

FILE="/root/batch.passwd"

# get all non-root user account

# By default on most linux non-root uid starts

# from 1000

USERS=$(awk -F: '{ if ( $3 > 1000 ) print $1}' /etc/passwd)

# create file with random password

echo "Generating file, please wait..."

# overwrite file, this is bash specific a better solution is cat > $FILE

>$FILE

for u in $USERS

p=$(pwgen -1 -n 8) # create random password

echo "$u:$p" >> $FILE # save USERNAME:PASSWORD pair

done

echo ""

echo "Random password and username list stored in $FILE file"

echo "Review $FILE file, once satisfied execute command: "

echo "chpasswd < $FILE"

# Uncomment following line if you want immediately update all users password,

# be careful with this option, it is recommended that you review $FILE first

# chpasswd < $FILE

Shell Script To Read IP Address ( Find Ip Address Script )

in Script last updated April 10, 2008

#!/bin/sh
# Shell script scripts to read ip address
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Get OS name
OS=`uname`
IO="" # store IP
case $OS in
   Linux) IP=`ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`;;
   FreeBSD|OpenBSD) IP=`ifconfig  | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'` ;;
   SunOS) IP=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '` ;;
   *) IP="Unknown";;
esac
echo "$IP"

#!/bin/sh

# Shell script scripts to read ip address

# -------------------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# -------------------------------------------------------------------------

# Get OS name

OS=`uname`

IO="" # store IP

case $OS in

Linux) IP=`ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`;;

FreeBSD|OpenBSD) IP=`ifconfig | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'` ;;

SunOS) IP=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '` ;;

*) IP="Unknown";;

esac

echo "$IP"

Monitor UNIX / Linux Server Disk Space with Shell Script

in Monitoring last updated April 10, 2008

Shell script to monitor or watch the disk space and send an email alert if the (free avilable) percentage of space is >= 90%

#!/bin/sh
# Shell script to monitor or watch the disk space
# It will send an email to $ADMIN, if the (free avilable) percentage 
# of space is >= 90% 
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# ----------------------------------------------------------------------
# Linux shell script to watch disk space (should work on other UNIX oses )
# SEE URL: http://www.cyberciti.biz/tips/shell-script-to-watch-the-disk-space.html
# set admin email so that you can get email
ADMIN="me@somewher.com"
# set alert level 90% is default
ALERT=90
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
  #echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge $ALERT ]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" | 
     mail -s "Alert: Almost out of disk space $usep" $ADMIN
  fi
done

#!/bin/sh

# Shell script to monitor or watch the disk space

# It will send an email to $ADMIN, if the (free avilable) percentage

# of space is >= 90%

# -------------------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# ----------------------------------------------------------------------

# Linux shell script to watch disk space (should work on other UNIX oses )

# SEE URL: http://www.cyberciti.biz/tips/shell-script-to-watch-the-disk-space.html

# set admin email so that you can get email

ADMIN="me@somewher.com"

# set alert level 90% is default

ALERT=90

df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;

#echo $output

usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1 )

partition=$(echo $output | awk '{ print $2 }' )

if [ $usep -ge $ALERT ]; then

echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |

mail -s "Alert: Almost out of disk space $usep" $ADMIN

done

Shell Script To Notify Admin User if UNIX / Linux System Load Crossed Certain Limit

in Monitoring last updated October 15, 2009

#!/bin/bash
# 
# Script to notify admin user if Linux,FreeBSD load crossed certain limit
# It will send an email notification to admin.
#
# Copyright 2005 (c) nixCraft project
# This is free script under GNU GPL version 2.0 or above. 
# Support/FeedBack/comment :  http://cyberciti.biz/fb/
# Tested os: 
# * RedHat Linux
# * Debain Linux
# * FreeBSD
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------

# Set up limit below
NOTIFY="6.0"

# admin user email id
EMAIL="root"

# Subject for email
SUBJECT="Alert $(hostname) load average"

# -----------------------------------------------------------------

# Os Specifc tweaks do not change anything below ;)
OS="$(uname)"
TRUE="1"
if [ "$OS" == "FreeBSD" ]; then
        TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)"
	FTEXT='load averages:'
elif [ "$OS" == "Linux" ]; then
        TEMPFILE="$(mktemp)"
	FTEXT='load average:'
fi


# get first 5 min load
F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1) | sed 's/ //g'"
# 10 min
F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2) | sed 's/ //g'"
# 15 min
F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3) | sed 's/ //g'"

# mail message
# keep it short coz we may send it to page or as an short message (SMS)
echo "Load average Crossed allowed limit $NOTIFY." >> $TEMPFILE
echo "Hostname: $(hostname)" >> $TEMPFILE
echo "Local Date & Time : $(date)" >> $TEMPFILE

# Look if it crossed limit
# compare it with last 15 min load average
RESULT=$(echo "$F15M > $NOTIFY" | bc)

# if so send an email
if [ "$RESULT" == "$TRUE" ]; then
        mail -s "$SUBJECT" "$EMAIL" < $TEMPFILE
fi

# remove file 
rm -f $TEMPFILE

#!/bin/bash

# Script to notify admin user if Linux,FreeBSD load crossed certain limit

# It will send an email notification to admin.

# This is free script under GNU GPL version 2.0 or above.

# Support/FeedBack/comment : http://cyberciti.biz/fb/

# Tested os:

# * RedHat Linux

# * Debain Linux

# * FreeBSD

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# -------------------------------------------------------------------------

# Set up limit below

NOTIFY="6.0"

# admin user email id

EMAIL="root"

# Subject for email

SUBJECT="Alert $(hostname) load average"

# -----------------------------------------------------------------

# Os Specifc tweaks do not change anything below ;)

OS="$(uname)"

TRUE="1"

if [ "$OS" == "FreeBSD" ]; then

TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)"

FTEXT='load averages:'

elif [ "$OS" == "Linux" ]; then

TEMPFILE="$(mktemp)"

FTEXT='load average:'

# get first 5 min load

F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1) | sed 's/ //g'"

# 10 min

F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2) | sed 's/ //g'"

# 15 min

F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3) | sed 's/ //g'"

# mail message

# keep it short coz we may send it to page or as an short message (SMS)

echo "Load average Crossed allowed limit $NOTIFY." >> $TEMPFILE

echo "Hostname: $(hostname)" >> $TEMPFILE

echo "Local Date & Time : $(date)" >> $TEMPFILE

# Look if it crossed limit

# compare it with last 15 min load average

RESULT=$(echo "$F15M > $NOTIFY" | bc)

# if so send an email

if [ "$RESULT" == "$TRUE" ]; then

mail -s "$SUBJECT" "$EMAIL" < $TEMPFILE

# remove file

rm -f $TEMPFILE