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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acctcms(1M) acctcms(1M)
NAME
acctcms - command summary from per-process accounting records
SYNOPSIS
[options] files
DESCRIPTION
reads one or more files, normally in the form described in acct(4). It adds all records for processes that executed identically-named com-
mands, sorts them, and writes them to the standard output, normally using an internal summary format.
Options
recognizes the following options:
Print output in
ASCII rather than in the internal summary format. The output includes command name, number of times executed, total kcore-
minutes, total CPU minutes, total real minutes, mean size (in K), mean CPU minutes per invocation, ``hog factor'', charac-
ters transferred, and blocks read and written, as in acctcom(1M). Output is normally sorted by total kcore-minutes.
Sort by total
CPU time, rather than total kcore-minutes.
Combine all commands invoked only once under
Sort by number of command invocations.
Any file names encountered hereafter are already in internal summary format.
Process all records as total accounting records.
The default internal summary format splits each field into prime- and non-prime-time parts. This option combines the prime
and non-prime time parts into a single field that is the total of both, and provides upward compatibility with old (i.e.,
UNIX System V) style internal summary format records.
The following options can be used only with the option.
Output a prime-time-only command summary.
Output a non-prime- (offshift) time only command summary.
When and are used together, a combination prime and non-prime time report is produced. All the output summaries are total usage except
number of times executed, CPU minutes, and real minutes which are split into prime and non-prime.
EXAMPLES
A typical sequence for performing daily command accounting and for maintaining a running total is:
WARNINGS
Unpredictable output results if is used on new-style internal-summary-format files, or if it is not used with old style internal summary
format files.
The process mean memory size may overflow for values greater than
SEE ALSO
acct(1M), acctcom(1M), acctcon(1M), acctmerg(1M), acctprc(1M), acctsh(1M), fwtmp(1M), runacct(1M), acct(2), acct(4), utmp(4).
STANDARDS CONFORMANCE
acctcms(1M)