System Information
uname (print system information)
- displays system information such as kernel version and system architecture
uname -a
df (report file system disk space usage)
- shows disk space usage in human-readable format
df -h
du (estimate file space usage)
- summarizes disk usage of a directory and its contents
du -sh directory_name
free (display memory space)
- shows free and used memory in the system
free -h
uptime (show system uptime)
- displays how long the system has been running
uptime