Linux Basics(1 of 6):
SYSTEM V (system 5)
Solaris (Developed by SUN Microsystems)
HP-UX (Developed by HP)
There are some UNIX versions that folow some good features from BSD standard and some from
System v standard they can be named as Hybrid Unix Like:
FILE TYPES IN LINUX:
In Linux/Unix every thing is treated as a file and every thing is represented by a file. Even devices
are represented by device files. There are four types files in Linux/Unix
1. Normal File:
Every file that contains data in it is caled normal file. E.g. execute able files,
Text files, movie files, audio files and Virus files etc.etc.
2. Directory File:
These are container files that hold other file and directories.
3. Link File :
These are like short cuts in windows. These just point towards the actual file.
4. Device File:
These represent devices. When ever we need to access a device we use these
files and these files gets the job done for us. These are present in /dev
THREE ROOTs IN LINUX/UNIX:
Word root is used for three entities in Linux/Unix
root user: Admin user of Unix/Linux systems is root user.
/root directory: Home directory of root user.
/: / is like my computer in Windows. It is the parent directory of al linux system.
Every thing is present under this directory
Note: Linux/Unix is case sensitive in every thing from username and password to parameters of file and command options.