A system administrator manages configuration, upkeep and reliable operations of computer operations. Sysadmin handles servers, has to manage system performance and security without exceeding the budget to meet users need.
A system administrator only deals with terminal interface and hence it is very important to learn and become master in commands to operate from terminal.
Some important commands for system administrators
Command
Function
man
Display information about all commands
uptime
Show how long system is running
users
Show username who are currently logged in
service
Call and execute script
pkill
Kill a process
pmap
Memory map of a process
wget
Download file from network
ftp or sftp
Connect remote ftp host
free
Show memory status
top
Display processor activity of system
last
Display user’s activity in the system
ps
Display about processes running on the system
Shutdown commands
Shutdown and reboot system
info
Display information about given command
env
Display environment variable for currently logged-in user
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