shell script to print memory usage to the screen (geektool)

memoryusage.sh

#!/bin/sh
# useful for [geektool](http://projects.tynsoe.org/en/geektool/)

/usr/bin/vm_stat | sed 's/\.//' | awk '
/free/ {FREE_BLOCKS = $3}
/inactive/ {INACTIVE_BLOCKS = $3}
/speculative/ {SPECULATIVE_BLOCKS = $3}
/wired/ {WIRED_BLOCKS = $4} 

END {
  TOTAL = 16384
  FREE = ((FREE_BLOCKS + SPECULATIVE_BLOCKS) * 4096) / 1048576
  INACTIVE = (INACTIVE_BLOCKS * 4096) / 1048576
  TOTAL_FREE = FREE + INACTIVE
  WIRED = (WIRED_BLOCKS * 4096) / 1048576
  ACTIVE = TOTAL - (TOTAL_FREE + WIRED)
  TOTAL_USED = INACTIVE + WIRED + ACTIVE
  
  printf "Free: %d\n", FREE
  printf "Inactive: %d\n", INACTIVE
  printf "Total Free: %d\n", TOTAL_FREE
  printf "Wired: %d\n", WIRED
  printf "Active: %d\n", ACTIVE
  printf "Total Used: %d\n", TOTAL_USED
}'