11-26-2007
Reading 5 Students names and grades using while loop????
How do I write a shell script file to read 5 student names (First and Last name) and their grades using a While Loop? Find the Average, Maximum, and Minimum of grades using the same While Loop. Prompt the user using tput to enter the information (first name, last name, grade). Save the data in a file called students.txt. Sort the file by last name and display it on the screen. Someone gave me this to go buy but im way basic and am not sure if there is anything missing from this. I also need to be able to use Tput.
If anyone can help me get this done or tell me whats missing id appreciate it.
1. suppose file is of form "Name Surname Grade"
#!/bin/zsh
sum=0
min=10000
max=0
n=5
i=0
file="students.txt"
cat $file | while read line; do
set line
grade=$3
sum='expr $sum + $grade'
if [ $grade -gt $max ]; then
max=$grade
fi
if [ $grade -lt $min ]; then
min=$grade
fi
i='expr $i + 1'
if [ $i -ge $n ]; then
break
fi
done
average='expr $sum / $i'
echo "Max: $max Min: $min Avg: $average"
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LEARN ABOUT DEBIAN
event::rpc::loop
Event::RPC::Loop(3pm) User Contributed Perl Documentation Event::RPC::Loop(3pm)
NAME
Event::RPC::Loop - Mainloop Abstraction layer for Event::RPC
SYNOPSIS
use Event::RPC::Server;
use Event::RPC::Loop::Glib;
my $server = Event::RPC::Server->new (
...
loop => Event::RPC::Loop::Glib->new(),
...
);
$server->start;
DESCRIPTION
This modules defines the interface of Event::RPC's mainloop abstraction layer. It's a virtual class all mainloop modules should inherit
from.
INTERFACE
The following methods need to be implemented:
$loop->enter ()
Enter resp. start a mainloop.
$loop->leave ()
Leave the mainloop, which was started with the enter() method.
$watcher = $loop->add_io_watcher ( %options )
Add an I/O watcher. Options are passed as a hash of key/value pairs. The following options are known:
fh The filehandle to be watched.
cb This callback is called, without any parameters, if an event occured on the filehandle above.
desc
A description of the watcher. Not necessarily implemented by all modules, so it may be ignored.
poll
Either 'r', if your program reads from the filehandle, or 'w' if it writes to it.
A watcher object is returned. What this exactly is depends on the implementation, so you can't do anything useful with it besides
passing it back to del_io_watcher().
$loop->del_io_watcher ( $watcher )
Deletes an I/O watcher which was added with $loop->add_io_watcher().
$timer = $loop->add_timer ( %options )
This sets a timer, a subroutine called after a specific timeout or on a regularly basis with a fixed time interval.
Options are passed as a hash of key/value pairs. The following options are known:
interval
A time interval in seconds, may be fractional.
after
Callback is called once after this amount of seconds, may be fractional.
cb The callback.
desc
A description of the timer. Not necessarily implemented by all modules, so it may be ignored.
A timer object is returned. What this exactly is depends on the implementation, so you can't do anything useful with it besides passing
it back to del_io_timer().
$loop->del_timer ( $timer )
Deletes a timer which was added with $loop->add_timer().
DIRECT USAGE IN YOUR SERVER
You may use the methods of Event::RPC::Loop by yourself if you like. This way your program keeps independent of the actual mainloop module
in use, if the simplified interface of Event::RPC::Loop is sufficient for you.
In your server program you access the actual mainloop object this way:
my $loop = Event::RPC::Server->instance->get_loop;
Naturally nothing speaks against making your program to work only with a specific mainloop implementation, if you need its features. In
that case you may use the corresponding API directly (e.g. of Event or Glib), no need to access it through Event::RPC::Loop.
AUTHORS
Joern Reder <joern at zyn dot de>
COPYRIGHT AND LICENSE
Copyright (C) 2002-2006 by Joern Reder, All Rights Reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.10.1 2006-04-23 Event::RPC::Loop(3pm)