loop method – Page 2

Shell Script To Delete Files In The First Directory Which Are Similarly Named In The Second Directory

in Decision Making, File-management last updated July 15, 2008

A shell script that accepts two directory names as arguments and deletes those files in the first directory which are similarly named in the second directory.

Shell Script To Count English Language Articles Such As 'A', 'An' and 'The'

in Decision Making, File-management last updated April 21, 2008

This script also covers following techniques:
=> Reading input text file line by line
=> Reading and processing words in input
=> Convert word to lowercase

#!/bin/bash
# Write a shell script that counts English language articles (a, an, the) 
# in a given text file.
#
# --------------------------------------------------------------------
# This is a free shell script under GNU GPL version 2.0 or above
# Copyright (C) 2005 nixCraft project.
# Feedback/comment/suggestions : http://cyberciti.biz/fb/
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
echo -n "Enter a file name : "
read file
a=0
the=0
an=0

# make sure file exist
if  [ ! -f $file ]
then
	echo "$file not a file!"
	exit 1
fi

# put while loop to read a $file
while read line
do
       #process each word 
	for w in $line 
	do
		# convert word to lowercase; so that we can count ThE, THE, the, THe etc all
		lword="$(echo $w | tr '[A-Z]' '[a-z]')"

		# is it 'a' article?
		[ $lword = "a" ] && (( a++ )) || :
		[ $lword = "the" ] && (( the++ )) || :
		[ $lword = "an" ] && (( an++ )) || :
	done
done < $file

# display stats
echo "a article occured $a times"
echo "the article occured $the times"
echo "an article occured $an times"

#!/bin/bash

# Write a shell script that counts English language articles (a, an, the)

# in a given text file.

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

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

# Feedback/comment/suggestions : http://cyberciti.biz/fb/

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

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

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

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

echo -n "Enter a file name : "

read file

a=0

the=0

an=0

# make sure file exist

if [ ! -f $file ]

then

echo "$file not a file!"

exit 1

# put while loop to read a $file

while read line

#process each word

for w in $line

# convert word to lowercase; so that we can count ThE, THE, the, THe etc all

lword="$(echo $w | tr '[A-Z]' '[a-z]')"

# is it 'a' article?

[ $lword = "a" ] && (( a++ )) || :

[ $lword = "the" ] && (( the++ )) || :

[ $lword = "an" ] && (( an++ )) || :

done

done < $file

# display stats

echo "a article occured $a times"

echo "the article occured $the times"

echo "an article occured $an times"

Shell Script to send HTTP Code 301 Moved Permanently Followed by Actual URL Redirection

in File-management last updated April 10, 2008

This script depends upon shell array.

#!/bin/bash
# Shell script to update old php files to point out to new CMS url
# it placed http code 301.
# You must create an array in following format:
# path/to/old/url1.php  path/to/new/url/slug/
# --------------------------------------------------------------------------
# Copyright (C) 2008 nixCraft project <http://www.cyberciti.biz/tips/contact-us>
# 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.
# -------------------------------------------------------------------------
declare -a t=("http://domain.com/1.php" "http://domain.com/new/path/slug/"
"http://domain.com/2.php" "http://domain.com/new/path/slug/"
"http://domain.com/3.php" "http://domain.com/new/path/slug/"
"http://domain.com/4.php" "http://domain.com/new/path/slug/"
"http://domain.com/5.php" "http://domain.com/new/path/slug/")
# set array total array size -1 ; if you have 5 item it should set to 4
for i in `seq 0 4` 
do
	#only work on zero or even element  
	if [ $i -eq 0 -o  $( expr $i % 2 ) -eq 0  ]; then
		s="${t[$i]}"
                d="${t[` expr $i + 1 ` ]}"
                file=$(basename $s)
 		echo "Patching $file...."
		if [ -f $file ]; then
		# if file exists, create new php redirection code
			echo '<?php'>$file
			echo 'header("HTTP/1.1 301 Moved Permanently");'>>$file
			echo 'header("Location: ' $d '");'>>$file
			echo '?>'>>$file
		fi
	fi
done

#!/bin/bash

# Shell script to update old php files to point out to new CMS url

# it placed http code 301.

# You must create an array in following format:

# path/to/old/url1.php path/to/new/url/slug/

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

# 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.

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

declare -a t=("http://domain.com/1.php" "http://domain.com/new/path/slug/"

"http://domain.com/2.php" "http://domain.com/new/path/slug/"

"http://domain.com/3.php" "http://domain.com/new/path/slug/"

"http://domain.com/4.php" "http://domain.com/new/path/slug/"

"http://domain.com/5.php" "http://domain.com/new/path/slug/")

# set array total array size -1 ; if you have 5 item it should set to 4

for i in `seq 0 4`

#only work on zero or even element

if [ $i -eq 0 -o $( expr $i % 2 ) -eq 0 ]; then

s="${t[$i]}"

d="${t[` expr $i + 1 ` ]}"

file=$(basename $s)

echo "Patching $file...."

if [ -f $file ]; then

# if file exists, create new php redirection code

echo '<?php'>$file

echo 'header("HTTP/1.1 301 Moved Permanently");'>>$file

echo 'header("Location: ' $d '");'>>$file

echo '?>'>>$file

done

Shell script to generate random files using RANDOM variable

in Tempfile last updated April 10, 2008

#!/bin/bash
# Shell script to generate random file method # 1 
#
# This is a free shell script under GNU GPL version 2.0 or above
#
# Copyright (C) 2005 nixCraft
#
# Feedback/comment/suggestions : http://cyberciti.biz/fb/

echo "List of temporary files : "
for i  in 1 2 3 4 5
do
   FILE="/tmp/$(basename $0).$RANDOM.txt"
   echo $FILE # show file name
   > $FILE # create files
done

#!/bin/bash

# Shell script to generate random file method # 1

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

# Feedback/comment/suggestions : http://cyberciti.biz/fb/

echo "List of temporary files : "

for i in 1 2 3 4 5

FILE="/tmp/$(basename $0).$RANDOM.txt"

echo $FILE # show file name

> $FILE # create files

done

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 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

Shell Script To Monitor Services Such As Web / Http, Ssh, Mail Server

in Monitoring last updated July 14, 2009

A Linux / UNIX Shell Script To Monitor Services Such As Web / Http, Ssh, Mail Server and send an email if they are down.

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