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Top Forums UNIX for Beginners Questions & Answers Noob question: How to check the total number of inputs entered by user? Post 303042048 by vbe on Thursday 12th of December 2019 08:30:23 AM
Old 12-12-2019
So your one-liner will not help you if you have more than 3, as it will not take account or will all be in num3, and if someone enters:
1,23,45 you are stuck too...
If you continue with your one-liner read, you will need num4 to be able to check more than 3 numbers were entered, after it does not matter...and you will have to check if you have a valid value in num 1-3 as what is stopping someone to enter "A"?
And while you don't have your 3 numerics in num1-3, you reinitialize your variable to 0 and start again...
---
wisecracker has also shown you what I had in mind and his suggestion solves partially your issue, only this more easy design looks like it is not an option here, as this seems more to be homework to see how smart you are to sort yourself out of this tricky issue when using in such manner the read command...
And so unless you can justify this is not homework and as such should have been posted in the adequate room and following the special rules there I will close this thread

Last edited by vbe; 12-12-2019 at 11:59 AM.. Reason: typos
 

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SA(1M)																	    SA(1M)

NAME
sa, accton - system accounting SYNOPSIS
sa [ -abcjlnrstuv ] [ file ] /etc/accton [ file ] DESCRIPTION
With an argument naming an existing file, accton causes system accounting information for every process executed to be placed at the end of the file. If no arguemnt is given, accounting is turned off. Sa reports on, cleans up, and generally maintains accounting files. Sa is able to condense the information in /usr/adm/acct into a summary file /usr/adm/savacct which contains a count of the number of times each command was called and the time resources consumed. This condensation is desirable because on a large system acct can grow by 100 blocks per day. The summary file is read before the accounting file, so the reports include all available information. If a file name is given as the last argument, that file will be treated as the accounting file; sha is the default. There are zillions of options: a Place all command names containing unprintable characters and those used only once under the name `***other.' b Sort output by sum of user and system time divided by number of calls. Default sort is by sum of user and system times. c Besides total user, system, and real time for each command print percentage of total time over all commands. j Instead of total minutes time for each category, give seconds per call. l Separate system and user time; normally they are combined. m Print number of processes and number of CPU minutes for each user. n Sort by number of calls. r Reverse order of sort. s Merge accounting file into summary file /usr/adm/savacct when done. t For each command report ratio of real time to the sum of user and system times. u Superseding all other flags, print for each command in the accounting file the user ID and command name. v If the next character is a digit n, then type the name of each command used n times or fewer. Await a reply from the typewriter; if it begins with `y', add the command to the category `**junk**.' This is used to strip out garbage. FILES
/usr/adm/acct raw accounting /usr/adm/savacct summary /usr/adm/usracct per-user summary SEE ALSO
ac(1), acct(2) SA(1M)
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