Skip to main content

Free Software

“Free software” means software that respects users' freedom and community. Roughly, it means that the users have the freedom to run, copy, distribute, study, change and improve the software. Thus, “free software” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech,” not as in “free beer”. We sometimes call it “libre software,” borrowing the French or Spanish word for “free” as in freedom, to show we do not mean the software is gratis.
The four essential freedoms
A program is free software if the program's users have the four essential freedoms:
§  The freedom to run the program as you wish, for any purpose (freedom 0).
§  The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.
§  The freedom to redistribute copies so you can help your neighbor (freedom 2).
§  The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.

A program is free software if it gives users adequately all of these freedoms. Otherwise, it is nonfree. While we can distinguish various nonfree distribution schemes in terms of how far they fall short of being free, we consider them all equally unethical.

Comments

Popular posts from this blog

KTU-FOSS LAB Solutions

Write shell scripts to show the following  ( you can write menu driven programs)
 Currently logged user and his logname ( logname)  Your current shell ( echo $SHELL)  Your home directory ( echo $HOME)  Your operating system type (echo $OSTYPE)  Your current path setting ( echo $PATH)  Your current working directory ( echo $PWD )  Show Currently logged  users ( w or who -H)      Show only the user name of logged users in the host ( users)      Details of last login ( last cek....where cek is the user id )  About your OS and version, release number, kernel version ( uname -a or  cat  /proc/version)  Show all available shells ( cat /etc/shells )  Show mouse settings (cat  /sys/class/input/mouse*/device/name )  Show computer CPU information       CPU details      ( cat /proc/cpuinfo | more )       Show information on  CPU architecture ( lscpu)       Number of Processor core ( nproc)  Show memory information       Memory details ( cat /proc/meminfo | more )       Display file system disk usage ( d…

Important Directories and Files

Important Directories
/bin                            holds the “essential” Linux commands and utilities /boot                          holds files required for boot process (kernel, vmlinuz, grub) /dev                            holds device files (hard drive, USB, CD-ROM, etc.) /etc                             holds system configuration files /etc/init.d                    holds scripts to start/stop network services /etc/rc.d                     holds system startup/shutdown scripts /etc/X11                      holds configuration files for X-windows /home                        holds user home directories (except for the root account) /lib                               holds system/shared library files /lost+found                holds files restored after system crash /mnt                            used as temporary mount point for CD-ROM, floppy, etc. /opt                              typically where large software applications are installed /proc                           holds kerne…

ER Diagrams to Table

REDUCING E-R DIAGRAM TO TABLE - A database which conforms to an E R diagram can be represented by collection of tables .For each entity set and for each relationship set in the database, we will create unique tables, which is assigned the name of the corresponding entity set or relationship sets . Each table has a no. of columns which have unique names. Each row in the table corresponds to an entity or a relationship.

REPRESENTATION OF STRONG ENTITY SET -Let E be a strong entity set with descriptive attributes a1, a2....aN . We represent this entity by table called E with N distinct columns, each of which corresponds to one of the attributes of E.

REPRESENTATION OF RELATIONSHIP SET - Let R be a relation ship set involving entity set E1,E2....En Let attribute(R) consists of 'm' attributes We can represent this relation ship set by a table called R with m distinct columns, each of which corresponds to one of the attributes in attribute (R) plus the primary key of E1..En.

REPRESENTI…