Linux memory

• free -hw - amount of free and used memory in the system (-h, --human, -w, --wide)
• vmstat -s- event counters and memory statistics (-s, --stats)
• vmstat -dw - disks activity statistics (-d, --disk, -w, --wide)
• vmstat -D - disks activity summary statistics (-D, --disk-sum)
• vmstat -p /dev/sda1 - disk partition activity statistics (-p, --partition)
• cat /proc/meminfo - misc info about memory
• lshw -class memory - info about memory devices
• lsmem - list the ranges of available memory