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# OS INFO
uname -a
uname -v
cat /etc/issue
cat /etc/os-release

# STORAGE ##################################### 
# checking disk storages
df -h

# more verbose version
df -k /path/to/file/or/dir


# PROCESSES ##################################### 
ps -ef|grep $process_name

# to see what processes are set to listen
sudo lsof -i -P

# particular port
sudo lsof -i -P | grep -i "80"

# NETWORK PORTS ##################################
sudo lsof -i :80

# to check PID details
ps u 12649