mail command – nixCraft

Linux / Unix Script: Simple Process Checker To Find Out If A Service Is Running or Not

in Monitoring last updated September 5, 2016

A simple shell script to find out whether critical services are running or, not under Linux or Unix operating systems. The script can send notification using email.

Shell script for search for no password entries and lock all accounts

in Security last updated April 10, 2008

#!/bin/bash
# Shell script for search for no password entries and lock all accounts
# -------------------------------------------------------------------------
# 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.
# -------------------------------------------------------------------------
# Set your email 
ADMINEMAIL="admin@somewhere.com"

### Do not change anything below ###
#LOG File
LOG="/root/nopassword.lock.log"
STATUS=0
TMPFILE="/tmp/null.mail.$$"

echo "-------------------------------------------------------" >>$LOG
echo "Host: $(hostname),  Run date: $(date)" >> $LOG
echo "-------------------------------------------------------" >>$LOG

# get all user names
USERS="$(cut -d: -f 1 /etc/passwd)"

# display message
echo "Searching for null password..."
for u in $USERS
do
  # find out if password is set or not (null password)
   passwd -S $u | grep -Ew "NP" >/dev/null
   if [ $? -eq 0 ]; then # if so 
     echo "$u" >> $LOG 
     passwd -l $u #lock account
     STATUS=1  #update status so that we can send an email
   fi  
done
echo "========================================================" >>$LOG 
if [ $STATUS -eq 1 ]; then
   echo "Please see $LOG file and all account with no password are locked!" >$TMPFILE
   echo "-- $(basename $0) script" >>$TMPFILE
   mail -s "Account with no password found and locked" "$ADMINEMAIL" < $TMPFILE
#   rm -f $TMPFILE
fi

#!/bin/bash

# Shell script for search for no password entries and lock all accounts

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

# 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.

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

# Set your email

ADMINEMAIL="admin@somewhere.com"

### Do not change anything below ###

#LOG File

LOG="/root/nopassword.lock.log"

STATUS=0

TMPFILE="/tmp/null.mail.$$"

echo "-------------------------------------------------------" >>$LOG

echo "Host: $(hostname), Run date: $(date)" >> $LOG

echo "-------------------------------------------------------" >>$LOG

# get all user names

USERS="$(cut -d: -f 1 /etc/passwd)"

# display message

echo "Searching for null password..."

for u in $USERS

# find out if password is set or not (null password)

passwd -S $u | grep -Ew "NP" >/dev/null

if [ $? -eq 0 ]; then # if so

echo "$u" >> $LOG

passwd -l $u #lock account

STATUS=1 #update status so that we can send an email

done

echo "========================================================" >>$LOG

if [ $STATUS -eq 1 ]; then

echo "Please see $LOG file and all account with no password are locked!" >$TMPFILE

echo "-- $(basename $0) script" >>$TMPFILE

mail -s "Account with no password found and locked" "$ADMINEMAIL" < $TMPFILE

# rm -f $TMPFILE

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

UNIX / Linux Shell Script For Monitoring System network with ping command

in Monitoring last updated August 1, 2009

#!/bin/bash
# Simple SHELL script for Linux and UNIX system monitoring with 
# ping command
# -------------------------------------------------------------------------
# Copyright (c) 2006 nixCraft project <http://www.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.
# -------------------------------------------------------------------------
# Setup email ID below
# See URL for more info:
# https://www.cyberciti.biz/tips/simple-linux-and-unix-system-monitoring-with-ping-command-and-scripts.html
# -------------------------------------------------------------------------

# add ip / hostname separated by white space 
HOSTS="cyberciti.biz theos.in router"

# no ping request
COUNT=1

# email report when 
SUBJECT="Ping failed"
EMAILID="me@mydomain.com"
for myHost in $HOSTS
do
  count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
  if [ $count -eq 0 ]; then
    # 100% failed 
    echo "Host : $myHost is down (ping failed) at $(date)" | mail -s "$SUBJECT" $EMAILID
  fi
done

#!/bin/bash

# Simple SHELL script for Linux and UNIX system monitoring with

# ping command

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

# 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.

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

# Setup email ID below

# See URL for more info:

# https://www.cyberciti.biz/tips/simple-linux-and-unix-system-monitoring-with-ping-command-and-scripts.html

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

# add ip / hostname separated by white space

HOSTS="cyberciti.biz theos.in router"

# no ping request

COUNT=1

# email report when

SUBJECT="Ping failed"

EMAILID="me@mydomain.com"

for myHost in $HOSTS

count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')

if [ $count -eq 0 ]; then

# 100% failed

echo "Host : $myHost is down (ping failed) at $(date)" | mail -s "$SUBJECT" $EMAILID

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