[Ubuntu] Memory 확인

Ubuntu 환경에서 현재 메모리 사용량을 free 명령을 통해 알 수 있다.

$ free -h
              total        used        free      shared  buff/cache   available
Mem:           7.8G        2.3G        3.6G        161M        1.9G        5.0G
Swap:           46G        472K         46G


$ free --help
Usage:
 free [options]

Options:
 -b, --bytes         show output in bytes
 -k, --kilo          show output in kilobytes
 -m, --mega          show output in megabytes
 -g, --giga          show output in gigabytes
     --tera          show output in terabytes
 -h, --human         show human-readable output
     --si            use powers of 1000 not 1024
 -l, --lohi          show detailed low and high memory statistics
 -t, --total         show total for RAM + swap
 -s N, --seconds N   repeat printing every N seconds
 -c N, --count N     repeat printing N times, then exit
 -w, --wide          wide output

     --help     display this help and exit
 -V, --version  output version information and exit