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you can use top to show the state of your system and all running process
and also the command free -m to show the state of your memory
ps -ef | grep <process-name> - To check whether the process / app is running or not
df -hcs - To check the total memory used by the current directory (and all its sub directory) and print in human readable format
chmod XXX <filename> - to change the read/write/execute permissions of a file.
lsmod - to list all loaded kernel modules
clear - to clear the command line window. Alternately, you can use CTRL+L to achieve the same.
To retrieve a long / complex command from history, press CTRL+R and then start typing the command. The login will retrieve the last matching command. keep pressing CTRL+R after this to match the previous commands till you reach the one you need, then press ENTER.
"df -h" - to check disk usage of the application and the system.
"systemctl status service.name" - to check the most important services the system is using.
