Shell Scripting

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http://bash.cyberciti.biz/monitoring/find-null-password-accounts/

1)# Script to display sum of two number and to do calculations such as +, -, / etc # ------------------------------------------------------------------------# 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. # ---------------------------------------------------------------------echo "**** My calculator ****" echo "M A I N - M E N U" echo "1. Multiplication" echo "2. Subtraction" echo "3. Remainder" echo "4. Divide" echo -n "Please select your choice (1-4) : " read choice echo read echo read

-n "Enter your first number : " n1 -n "Enter your second number : " n2

if [ $choice -eq 1 ] then answer="$n1 x $n2 = $(( $n1 * $n2 ))" elif [ $choice -eq 2 ] then answer="$n1 - $n2 = $(( $n1 - $n2 ))" elif [ $choice -eq 3 ] then Answer="$n1 % $n2 = $(( $n1 % $n2 ))" elif [ $choice -eq 4 ] then answer="$n1 / $n2 = $(( $n1 / $n2 ))" else echo "Sorry please select number between 1-4 only" exit 1 fi echo $answe 2)#!/bin/bash # Shell script to read 3 numbers and find the greaters of the three # ------------------------------------------------------------------------# 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. # ----------------------------------------------------------------------

echo -n "Please enter three numbers (separate number by space) : " read a b c # compare a with b and c. Note -a is logical and operator if [ $a -gt $b -a $a -gt $c ] then big=$a elif [ $b -gt $a -a $b -gt $c ] # compare b with a and c then big=$b elif [ $c -gt $a -a $c -gt $b ] # compare c with a and b then big=$c elif [ $a -eq $b -a $a -eq $c -a $b -eq $c -a $c -eq $b ] # see if all of them are equal or not then big="All three numbers are same (equal)" else # something must be wrong if we are here, like one of number is character such as 'A' big="Can not guess greaters of three numbers" fi # display resul 3)#!/bin/bash # Shell script to read a number and write the number in words. Use case # control structure. For example 12 should be print as one two # ------------------------------------------------------------------------# Copyright (c) 2005 nixCraft project # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------# This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------echo -n "Enter number : " read n len=$(echo $n | wc -c) len=$(( $len - 1 )) echo "Your number $n in words : " for (( i=1; i<=$len; i++ )) do # get one digit at a time digit=$(echo $n | cut -c $i) # use case control structure to find digit equivalent in words case $digit in 0) echo -n "zero " ;; 1) echo -n "one " ;; 2) echo -n "two " ;; 3) echo -n "three " ;; 4) echo -n "four " ;; 5) echo -n "five " ;; 6) echo -n "six " ;; 7) echo -n "seven " ;; 8) echo -n "eight " ;;

9) echo -n "nine " ;;

esac done

# just print new line echo "" 4) !/bin/bash # Shell script to calulate area and Circumference of circle. # It take radius of a circle as input. # ------------------------------------------------------------------------# 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. # ---------------------------------------------------------------------# Lesson on Circumference of a Circle : # Visit http://www.mathgoodies.com/lessons/vol2/circumference.html echo -n "Enter the radius of a circle : " read r # use formula to get it area=$(echo "scale=2;3.14 * ($r * $r)" | bc) # use formula to get it d=$(echo "scale=2;2 * $r"|bc) circumference=$(echo "scale=2;3.14 * $d"| bc) echo "Area of circle is $area" echo "Circumference of circle is $circumference" 5) #!/bin/bash # Script to read price of an article. If the price is less than 100 # then display "No discount" else give a discount of 10%. Display # the price of article after discount # ------------------------------------------------------------------------# 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. # ------------------------------------------------------------------------echo -n "Enter price of an article : " read price if [ $price -lt 100 ] then echo "No discount " d=0 # 0 means no discount else echo "10% discount " d=$(( $price * 10 / 100 )) # 10% discount fi # how much user need to pay? after discount pay=$(( $price - $d )) echo "You need to pay INR. $pay" 6) #!/bin/bash

# # # # # # # # #

Shell program to calculate the number of digits in a number read from the user ----------------------------------------------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. -------------------------------------------------------------------------

echo -n "Enter number : " read n sd=0 # store number of digit nd=0 on=$n # store $n so that we can use it later # use while loop to caclulate the number of digit while [ $n -gt 0 ] do sd=$(( $n % 10 )) # get Remainder n=$(( $n / 10 )) nd=$(( $nd + 1)) # calculate all digit in a number till n is not zero done echo "Numnber of digit in a $on is $nd" 7) #!/bin/bash # Shell script to read a character (upper or lower), digit, special symbol and # display message according to the character entered # ----------------------------------------------# 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. # ------------------------------------------------------------------------char="" echo -n "Enter a one character : " read char # use sed command to determine input character is digit or not # -e : start script # s/[0-9]// : Attempt to match regex [0-9] i.e. all digit against the pattern space (echo $char). # If successful, replace that portion matched with replacement i.e. // do nothing. # g : Global replacement # so if digit are in input it will replace all those digit, and if input is only digit, nothing # is left i.e. string is zero and that is what tasted with -z if [ -z $(echo $char | sed -e 's/[0-9]//g') ] then echo "$char is Number/digit" elif [ -z $(echo $char | sed -e 's/[A-Z]//g') ] # find out if character is upper

then

echo "$char is UPPER character"

elif [ -z $(echo $char | sed -e 's/[a-z]//g') ] # find out if character is lower then echo "$char is lower character" else echo "$char is Special symbol" # else it is special charact 8) #!/bin/bash # Shell Script to ask user his/her name and then display it with a # GoodDay/Good morning message # ------------------------------------------------------------------------# 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. # ------------------------------------------------------------------------echo "Hi! I'm $(hostname) computer!!" echo -n "May I know your name please ? " read yourname echo "Goo Day $yourname" 9) #!/bin/bash # Script to update user password in batch mode # You must be a root user to use this script # ------------------------------------------------------------------------# Copyright (c) 2005 nixCraft project # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------# This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ---------------------------------------------------------------------# /root is good place to store clear text password FILE="/root/batch.passwd" # get all non-root user account # By default on most linux non-root uid starts # from 1000 USERS=$(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 < $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 < $FILE 10) #!/bin/bash # Shell script to Finding Accounts with No Password # Useful to improve system security # Copyright (c) 2005 nixCraft project # This script is licensed under GNU GPL version 2.0 or above # For more info, please visit: # http://cyberciti.biz/shell_scripting/bmsinstall.php # TODO # - Disable all account w/o password # - Send an email to admin # ------------------------------------------------------------------------# This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------SPATH="/usr/local/etc/bashmonscripts" INITBMS="$SPATH/defaults.conf" [ ! -f $INITBMS ] && exit 1 || . $INITBMS if ( isRootUser ); then $GREP -v -E "^#" $SHADOW_FILE | $AWK -F: '$2 == "" { print $1 }' else echo "Permission denied [$($ID -u)]" fi 11) #!/bin/bash # Script to display the text entered by the user in bold # ------------------------------------------------------------------------# Copyright (c) 2005 nixCraft project # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------# This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ---------------------------------------------------------------------# read man page of tput command. echo -n "Enter text : " read text echo "Here is what you entered " # use tput command to display it in bold tput bold echo "$text" echo -n "Press any key to continue..." # okay turn of bold effect read key # it will clear screen too tput reset 12) !/bin/bash # Shell program to display numbers from 1 to 10 # ----------------------------------------------# 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. # ------------------------------------------------------------------------# using for loop echo "Using for loop method # 1... " for i in 1 2 3 4 5 6 7 8 9 10 do echo -n "$i " done echo "" # this is much better as compare to above for loop echo "Using for loop method # 2... " for (( i=1; i<=10; i++ )) do echo -n "$i " done echo "" # use of while loop echo "Using while loop..." j=1 while [ $j -le 10 ] do echo -n "$j " j=$(( j + 1 )) # increase number by 1 done echo "" 13) #!/bin/bash # Shell script to read 5 digit number and calculate the sum of digit # ------------------------------------------------------------------------# Copyright (c) 2005 nixCraft project # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------# This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------echo -n "Enter numnber : " read n # find out length of string using wc -c command len=$(echo $n | wc -c) # remove \n i.e. new line character len=$(( $len - 1 )) # use loop to go throug all digit one by one and calculate sum of digit on fly for (( i=1; i <= $len; i++ )) do sum=$(( $sum + $(echo $n | cut -c $i) )) done echo "Sum of $n is $sum"

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