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
Display information about all commands
Show how long system is running
Show username who are currently logged in
Call and execute script
Kill a process
Memory map of a process
Download file from network
ftp or sftp
Connect remote ftp host
Show memory status
Display processor activity of system
Display user’s activity in the system
Display about processes running on the system
Shutdown and reboot system
Display information about given command
Display environment variable for currently logged-in user
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