Free usage software for linux

SysUsage is a system monitoring and alarm reporting tool. The project can generate historical graph views of CPU, memory, IO, network and disk usage, and much more.
Main features:
- Load average.
- CPUs usage. (total, system, user, iowait, idle, steal)
- Memory usage (with and without cache).
- Share memory usage (POSIX /dev/shm).
- Swap usage.
- Page swapping.
- Page I/O stats.
- R/W request stats.
- R/W block stats.
- Created process per second.
- Percentage of open file regarding to file-max.
- Number of socket in use. With TCP versus UDP.
- Any active network interface usage.
- Errors on network interface (bad packet, dropping, collision.
- Any mounted partition disk space usage.
- Monitoring running process.
- Monitoring number of file in queue directory.
USAGE
Once you have correctly installed and configured SysUsage the best way to run it is by croni job. As it is very fast you can set running time each minute. This is the default interval used in the graph report tool sysusagegraph. So I recommand you to do so or to modify this script to match you interval.
Here is how I use it with an installation with all path by default :
*/1 * * * * /INSTALL_DIR/sysusage
*/5 * * * * /INSTALL_DIR/sysusagegraph
If you have change the default installation path (/usr/local/sysusage) you need to give these script the path to the configuration into the command line argument using -c option. To know what arguments can be passed use option -h or --help.

Test::Usage is a different approach to testing: selective, quieter, colorful.

SYNOPSIS

Lets say we are building module Foo.pm. To exercise it, we write a usage examples module, Foo_T.pm, which may eventually look something like this:

package Foo_T;
use Test::Usage;
use strict;
use warnings;
use Foo;

example(e1, sub { ... ok(...); ... die "Uh oh"; ... });
example(a1, sub { ... ok(...) or diag(...); ... });
example(a2, sub { ... ok(...); ... });
example(a3, sub {
my $f = Foo->new();
my $got_foo = $f->foo();
my $exp_foo = FOO;
ok(
$got_foo eq $exp_foo,
"Expecting foo() to return $exp_foo.",
"But got $got_foo."
);
});
Here are a few ways to test its examples:
# Run example a3 only.
perl -MFoo_T -e test(a => "a3")

# Run all examples whose label matches glob a*: a1, a2, a3.
perl -MFoo_T -e test(a => "a*")

# Run all examples found in the test module.
perl -MFoo_T -e test

# Run example a3, reporting successes also, but without color.
perl -MFoo_T -e test(a => "a3", v => 2, c => 0)

# Run and summarize all examples in all "*_T.pm" files found under
# current directory.
perl -MTest::Usage -e files

As the name already suggests, ncdu is an NCurses version of the famous old du unix command.

NCurses Disk Usage provides a fast and easy interface to your harddrive. Where is your disk space going? Why is your home directory that large? ncdu can answer those questions for you in just a matter of seconds!

Example NAT usage is a little script to show a NAT usage example.

Sample:

#----------------------#
# Variable Definitions #
#----------------------#

EXT=eth0
INT=eth1

# "Masquerading" Example
PRIV_NETS="128.111.1.1 128.111.185.0/255.255.255.0"
MASQ_NET=192.168.1.0/255.255.255.0

# "General SNAT" Example
MAP_FROM=192.168.1.0/255.255.255.0
MAP_TO=128.111.185.30-128.111.185.42

# "Redirection" Example
INTERNAL_IP=10.10.1.1

# "Port Forwarding" Example
EXTERNAL_IP=128.111.1.200
NEWS_SERVER=10.10.1.38
MAIL_SERVER=10.10.1.69

# "Load Balancing" Example
VIRTUAL_SERVER=news.sblug.com
SERVER_RANGE=10.10.1.9-10.10.1.15

#-------------#
# NAT Section #
#-------------#

#
# Flush previous rules
#

iptables -t nat -F


#
# Masquerading
#

# Masquerading for outgoing connections, except privileged nets are exempt
for NET in $PRIV_NETS ; do
iptables -t nat -A POSTROUTING -d $NET -o $EXT -j ACCEPT
done
iptables -t nat -A POSTROUTING -s $MASQ_NET -o $EXT -j MASQUERADE


#
# General SNAT
#

# Internal computers w/ private ips "borrow" public ips of other internal computers to ssh out
iptables -t nat -A POSTROUTING -s $MAP_FROM -o $EXT -p tcp --dport ssh -j SNAT --to-source $MAP_TO
iptables -t nat -A POSTROUTING -s $MAP_FROM -o $EXT -p udp --dport ssh -j SNAT --to-source $MAP_TO


#
# Redirection
#

# Redirect internal net http traffic through squid proxy, but allow direct access to local web server
iptables -t nat -A PREROUTING -i $INT -d ! $INTERNAL_IP -p tcp --dport www -j REDIRECT --to-port 8080


#
# Port Forwarding
#

# Forward gateway port 7000 to news server and gateway port 8000 to pop mail server
iptables -t nat -A PREROUTING -d $EXTERNAL_IP -p tcp --dport 7000 -j DNAT --to-dest $NEWS_SERVER:nntp
iptables -t nat -A PREROUTING -d $EXTERNAL_IP -p tcp --dport 8000 -j DNAT --to-dest $MAIL_SERVER:pop3

#
# Load Balancing
#

# Basic load balancing by redirecting nntp requests to any of several local news servers
iptables -t nat -A PREROUTING -d $VIRTUAL_SERVER -p tcp --dport nntp -j DNAT --to-dest $SERVER_RANGE

Wchange provides a very simple wallpaper changer.

It requires only java runtime environment (JRE) and gconftool-2.

Usage:

java Wchange /home/folder/pictures/ seconds [random]

Where:

/home/folder/pictures/ is the directory where are wallpapers

seconds is how much time the system will wait between wallpaper switching

random (optional) use it only if you want wallpaper random switching

gimmage is an image viewer that is perfect for command line usage as it accepts directories and image filenames as arguments.

It has an in-application file browser that allows users to select and drag images and directories into the image viewing area in order to have them displayed.

durep creates disk usage reports with bar graphs, allowing one to easily deduce which directories are using the most space.

Although durep can produce text output similar to do, its real power lies in the ability to store reports in a file, which can then be viewed as a web page with the supplied cgi script.

KStatus enhanced is a modified version of a note SuperKaramba panel: Kstatus 1.1.
Ive removed the XMMS info panel and addedd the harware monitoring feature. So Ive updated the icon set too.
It monitors:
- System Info
- CPU usage
- RAM usage
- HDD usage
- Network usage
- System uptime
- System temperature