I decided to take a Unix Introduction class and have never had experience with programming. Everything was fine until recently when the Prof. started shell scripting and he wants us to make a small script to add unlimited numbers from arguments and from standard input.
I admit I am really bad at understanding his teaching, for one. He teaches this class as you had previous experience with programming and when i ask him questions he is very evasive with his answers. My problem is that he didn't have a lecture about flowcharts and i don't understand how to make it work for unlimited numbers introduced.
I was able to make a small script that can add 5 numbers from arg and 5 from input but that is all. he told me to use whiles and fors but i cant seem to grasp the logic so now I am asking you for my help.
I will post here his requirements for the script and also the code for the script that i wrote hoping that somebody can help me.
I appreciate all the help and i will check later with you.
advance happy new year to all,
i am having a script.The purpose of the scripts is as follows.If the current month is march,june,september or december ,inc_flg should be set to '1' otherwise inc_flg should be set to '2'
month= date +"%m"
if || || ||
; then
inc_flg = 1
else
... (6 Replies)
I have to complete my assignment and i need help...
These are two simple shell script programs :
1.) Write a shell script to display files in the current directory in the following format :
FileName Size Date Protection Owner
_______ ____ ___ ________ _____
2.) Write a... (1 Reply)
I'm new to this and I need help with writing a script. The following assignment is as follows...
Create a shell script named Project3-8 located in a directory supported by the File System Hierarchy Standard.
The script needs to perform the following pseudocode in the order shown:
-Display... (1 Reply)
Hello,
was just wondering how to compare strings in unix? I mean as in C there is a function strcmp() in string.h, is there any function in unix for that? I tried using
if
and all such variations but didn't succeed. Any help would be appreciated. Thanks in advance :) (9 Replies)
I am begining to learn bourne shell and as a practice I have written a script which when given the purchase price and percentage of discount calculates the savings.
I somehow cannot figure out why my script fails to do arthimatic calculation on real numbers.
Could anyone look at the script... (5 Replies)
Hello everybody,
I decided to take a Unix Introduction class and have never had experience with programming. Everything was fine until recently when the Prof. started shell scripting and he wants us to make a small script to add unlimited numbers from arguments and from standard input.
I... (8 Replies)
Hi,
I need a help with arithmetic calculations in my script. I have two variables: a=17; b=1712
I want to perform ($a/$b)*100 with two decimals in the result.
I tried with following:
res=$((100*a/b))
res=`echo "scale=2; $a / $b" | bc`
But I am not getting the decimal values.... (4 Replies)
NUMSUM(1) User Contributed Perl Documentation NUMSUM(1)NAME
numsum - numsum program file
SYNOPSIS
numsum [-iIcdhrsvxy] <FILE>
| numsum [-iIcdhrsvxy] (Input on STDIN from pipeline.)
numsum [-iIcdhrsvxy] (Input on STDIN. Use Ctrl-D to stop.)
DESCRIPTION
numsum will take all the numbers on stdin and return the sum of those numbers. Currently it only processes the first number on each line.
Besides positive numbers, it also handles negative numbers and numbers with decimals.
OPTIONS -i Only return the integer portion of the final sum.
-I Only return the decimal portion of the final sum.
-c Print out the sum of each column.
-r Print out the sum of each row.
-x <n> Specify a comma seperated list of columns to print.
-y <n> Specify a comma seperated list of rows to print.
-s <string> Specify a string to use as a seperator for columns.
This defaults to be consecutive whitespace (s+).
-h Help: You're looking at it.
-V Increase verbosity.
-d Debug mode. For developers
-q Quiet mode, don't print any warnings.
EXAMPLES
Simply add up the numbers in a file.
$ numsum numbers.txt
4315
Enter your own numbers on STDIN. The last number is the answer.
$ numsum
4
21
98
100
223
Use it in a command pipeline.
$ ls -1s | grep .mp3 | numsum -c -x 5
72288
Add up the total byte count in a http log file.
$ cat access_log | awk {'print $10'} numsum
or
numsum -c -x 10 access_log
Add up the columns of numbers of a file.
$ cat columns
1 6 11 16 21
2 7 12 17 22
3 8 13 18 23
4 9 14 19 24
5 10 15 20 25
$ numsum -c columns
15 40 65 90 115
Add up the 1st, 2nd and 5th columns only.
$ numsum -c -x 1,2,5 columns
15 40 115
Add up the rows of numbers of a file.
$ numsum -r columns
55
60
65
70
75
Add up the 2nd and 4th rows.
$ numsum -r -y 2,4 columns
60
70
SEE ALSO numaverage(1), numbound(1), numinterval(1), numnormalize(1), numgrep(1), numprocess(1), numrandom(1), numrange(1), numround(1)COPYRIGHT
numsum is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license. Please read the COPYING
and LICENSE files that came with the num-utils package
Developers can read the GOALS file and contact me about providing
submitions or help for the project.
MORE INFO
More info on numsum can be found at:
http://suso.suso.org/programs/num-utils/
perl v5.10.1 2009-10-31 NUMSUM(1)