Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com
Answertopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

6.1. Concept Definitions

All three of the following definitions are called " File Streams." They hold information that is either received from somewhere or sent to somewhere. In a UNIX system, the keyboard input (standard input), information printed to the screen (standard output) and error output (also printed to the screen) are treated as separate File Streams.

Standard output

Standard output is the output from the program printed to the screen, not including error output (see below).

Standard input

Standard input is the input from the user. Normally the keyboard is used as the standard input device in a UNIX system.

Standard error

Standard error is error output from programs. This output is also sent to the screen and will normally be seen mixed in with standard output. The difference between standard output and standard error is that standard error is unbuffered (it appears immediately on the screen) and standard error is only printed when something goes wrong (it will give you details of what went wrong).

 
 
  Published under the terms of the GNU General Public License Design by Interspire