Linux login / logout log to limit computer
I would like to know how to register the login and logout of a user: it would be difficult to measure how long someone was connected in a month.
I know the "last" command can be used. But this command is based on a file that has r / w permission for the user, hence the ability to modify this data. I would like to register this data within two months.
Why would I do this? In fact, I would like to prevent regular users from using the computer (mostly graphics mode) for more than an hour a day - except weekends and 10 hours in total per week.
Cedric
(System used: kubuntu, / Programming language: bash script)
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Not exactly what you're looking for, but this article shows you how to restrict a user to only be able to log in for a specified time.
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Here's a Perl script that summarizes the content printed last
. It is based on an example from the book Running Linux , cleaned up for readability, and fixed to work on a modern machine (the last's
output format seems to have changed since the original was written). Save the code in a file and you can run it by outputting last
to it.
#!/usr/bin/perl
# logintime.pl - Summarise amount of time a user is logged in.
# Usage: last | perl logintime.pl
use strict;
use warnings;
my %hours;
my %minutes;
my %logins;
# While we have input...
while ( <> ) {
# Extract the username and login time...
if ( my ($username, $hrs, $mins) = /^(\S+).*\((\d+):(\d+)\)/ ) {
# Increment total hours, minutes, and logins
$hours{$username} += $hrs;
$minutes{$username} += $mins;
$logins{$username}++;
}
}
# For each unique user...
foreach my $user ( sort keys %hours ) {
# Calculate the total hours and minutes...
$hours{$user} += int($minutes{$user} / 60);
$minutes{$user} %= 60;
# Print the information for this user...
print "User $user, total login time ";
printf "%02d:%02d, ", $hours{$user}, $minutes{$user};
print "total logins $logins{$user}.\n";
}
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