Title: Programs and Software
Course: CIS 121: Linux/UNIX I: Fundamentals ~ For IGNITE Review > Section: Learning Modules

Productivity Software

A tremendous amount of productivity software is available, much of it is free. For example:

- Web Browsers - many available including Firefox and Chrome
- Email Clients - Thunderbird, Evolution
- Office - LibreOffice, OpenOffice
- Multimedia
  - Audio Editor - Audacity
  - 3-D image creation software - Blender
  - Sill image software similar to Photoshop - The GIMP
  - Command line-based image manipulation software - ImageMagick

Server Programs

Run in the background unattended and are often called 'daemons'. They are often started when a system boots and are often controlled and started using /etc/init.d or /etc/rc.d.

Security issues with server programs include:

- The need for good, protected passwords
- Keeping you software updated
- Having proper control of users

Server programs are assigned to specific ports, such as:

- FTP: 20-21
- SSH: 22
- Telnet: 23
- SMTP: 25
- DNS: 42
- BOOTP, DHCP: 67
- HTTP:80