1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | #!/bin/bash # Shell program to read a number and reverse the number # for example 123 should output as 321 # ----------------------------------------------- # 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. # ------------------------------------------------------------------------- echo -n "Enter number : " read n # store single digit sd=0 # store number in reverse order rev="" # store original number on=$n # use while loop to caclulate the sum of all digits while [ $n -gt 0 ] do sd=$(( $n % 10 )) # get Remainder n=$(( $n / 10 )) # get next digit # store previoues number and current digit in rev rev=$( echo ${rev}${sd} ) done echo "$on in a reverse order $rev" |
Tag: digits
Shell program to calculate the number of digits in a number read from the user
in Categories Academic, Shell Math last updated April 8, 20081 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #!/bin/bash # Shell program to calculate the number of digits in a # number read from the user # ----------------------------------------------- # Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/> # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------- # This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------- echo -n "Enter number : " read n sd=0 # store number of digit nd=0 on=$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" |
Shell script to read a character (upper or lower), digit, special symbol and display message according to the character entered
in Categories Decision Making last updated April 5, 2008This script uses sed command to find out all digits or upper characters. -z string (conditional expression) will return true if the length of string is zero.
Script logic
Read one character
[1] Use sed command to determine input character is digit or not (sed -e ‘s/[A-Z]//g’))
[2] Attempt to match regex [0-9] i.e. all digit against the pattern space
[3] If successful, replace that portion matched with replacement // i.e. do nothing.
If digits 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 conditional expression.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #!/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 <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. # ------------------------------------------------------------------------- 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 character fi |