The common inspection commands in Linux mainly include system information viewing, resource monitoring, and network status checking.
System Information Viewing
uname -a: Displays kernel version, hostname, and other system information.
hostname: View or set the hostname.
cat /etc/redhat-release: View the operating system version (for Red Hat systems).
Resource Monitoring
free -m: View memory usage (in MB).
df -h: Display disk space usage (in a human-readable format).
top/htop: Real-time monitoring of CPU, memory, and process resources.
Network Status Checking
ifconfig/ip addr: View network interface configuration and IP address.
netstat -an: Display network connections, listening ports, etc.
route -n: View the routing table.
Process and Service Management
ps -ef: List all processes.
systemctl status <service_name>: Check the status of a service (requires systemd).
iptables -L: View firewall rules.
Security and Logs
dmesg: View kernel logs.
journalctl: Query systemd logs (requires systemd).
grep PermitRootLogin /etc/ssh/sshd_config: Check SSH remote login permissions.
Other Useful Commands
uptime: View system uptime and load.
lscpu: Display CPU architecture information.
lsmod: List loaded kernel modules.