3. linuxadmincoursetraining.vibranttechnologies.co.in
Sysadmins
⢠System administration handled by various people
â Full time dedicated sysadmins on site
â Remote services
â Generic âITâ personnel
â That user that seems to know what theyâre doing
⢠Can be a skill set central to a career path, or a
means to an end
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4. linuxadmincoursetraining.vibranttechnologies.co.in
Privilege Hierarchy
⢠Want to divide system privilege by account
⢠First step is file level permissions
â Default permissions limit end users in what
configuration files they can read and which programs
they can run
⢠Next level is within system programs
â Limit certain functions to only users with âelevatedâ
privileges
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5. linuxadmincoursetraining.vibranttechnologies.co.in
The Superuser
⢠By default, one account has elevated privileges to
issue any command, access any file, and perform
every function
⢠Superuser, a.k.a. root
â Technically, can change to anything â but donât
⢠User and group number 0
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6. linuxadmincoursetraining.vibranttechnologies.co.in
The Superuser, cont
⢠Must limit use of root
â Inexperienced users can cause serious harm
â Use of root for non-privileged tasks unnecessary and
can be open to attack
â Security and privacy violations â root can look at
anyoneâs files
⢠Limit what root can do remotely
⢠Ensure a strong password
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7. linuxadmincoursetraining.vibranttechnologies.co.in
sudo
⢠Allows you to issue a single command as another
user
⢠Syntax:
sudo [options] [-u user] command
⢠Again, if no user specified, root assumed
⢠New shell opened with userâs privileges
⢠Specified command executed
⢠Shell exited Mumbai,
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8. linuxadmincoursetraining.vibranttechnologies.co.in
Understanding Operating Systems
⢠Software
â Collection of instructions that control the tasks
a computer performs
â Can be changed without disassembling the
computer and rewiring
⢠Operating system
â Software that helps other programs control
computer hardware and interact with users
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10. linuxadmincoursetraining.vibranttechnologies.co.in
Operating System Functions
⢠Initialize computer hardware
⢠Allocate system resources to programs
⢠Keep track of multiple programs running at
same time
⢠Provide organized method for all programs
to use system devices
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12. linuxadmincoursetraining.vibranttechnologies.co.in
The UNIX Operating System
⢠UNIX
â Operating system
â Originally created at AT&T Bell Labs in
early 1970s
â Designed to control networked computers that
were shared by many users
â Features and low cost of Linux effectively
driving UNIX out of market
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13. linuxadmincoursetraining.vibranttechnologies.co.in
The Free Software Foundation
and the GNU Project
⢠Free software foundation (FSF)
â Software itself should not be restricted in
distribution by standard commercial license
agreement
⢠GNU project
â Completely free version of UNIX
â Written from scratch
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14. linuxadmincoursetraining.vibranttechnologies.co.in
Where to Get More Information
Vibrant Group:
www.vibrantgroup.co.in
Vibrant Technologies & Computers
www.vibranttechnologies.co.in/technologies.vibrantgroup.co.
in
Vibrant HR Team
www.hr.vibrangroup.co.in
B2/6/2 Vashi ,Navi Mumbai,
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